Introducing the SL-15 | My Best AR-15 Lower Yet

The information contained in this video is for educational purposes only. It is not intended to be a substitute for professional firearms training or instruction. Safety is paramount when handling firearms. Always follow the four rules of firearms safety.
Additionally, it is important to be a law-abiding citizen when owning and using firearms. This includes understanding and complying with all applicable laws and regulations. If you are considering purchasing or using a firearm, please seek out qualified instruction from a reputable firearms instructor. BY WATCHING THIS VIDEO, YOU AGREE TO THE FOLLOWING: You are of legal age to own and use firearms in your jurisdiction. You understand and will follow all applicable laws and regulations related to firearms.

[@SebbyRuiz]

Once again, thank you for your work in the 3D2A community Tim!!

[@test-np9qu]

He's a legend 👍

[@brianumbarger9790]

Thank you! True freedom right there!

[@spaz13b]

Hoffman is the real MVP! 👏👏👏

[@TOMAS-lh4er]

This is how people become famous, step by step, I love following him !!

[@JreUK]

[@thehalo121]

Thank you Hoffman. You are a national treasure. One day books will be written about you . And your exploits will be taught in history class

[@justanotherinternetexpert7743]

Only if we actually win. ....Victors write history, ...and we can only win, if we all get off the couch and take the threat as seriously as it is. You can't win if you don't fight, and you will never fight if your day to day life, comfort, and what people think of you, is more important than your freedoms, and your children's children's future freedoms.

[@jmsether]

There is a video titled more Hoffman per Hoffman 😜

[@BHoff77]

hear hear

[@josephvarner603]

You are my digital hero. As far as the clamp goes anyone with design experience knows that you can't in good conscious implement an inferior solution. 4.8 looks great!

[@sdrowlette]

I’m on Team Hose Clamp! Great job Hoffman!

[@test-np9qu]

Get with the clamp or get lost!

[@MrGreen-q2n]

clamp gang clamp gang@@test-np9qu

[@TeranRealtor]

You are really doing the work of freedom! Thank you so much for your perseverance and for your great design ideas. I've never 3D printed anything (though every rifle I've ever owned, I made from an 80% lower - most polymer). I look forward to the day that I 3d print my first lower!

[@davidwalsh5423]

My dude!! You are on a roll brother. Thank you so much for all you do for our community, please keep it up! Stay Super Safe, my friends.

[@HilltopZombieShop]

Totally new to his channel. Which printer is needed and where do you get the files to print one?

[@davidwalsh5423]

@@HilltopZombieShopYes

[@Jonbo117]

​@@HilltopZombieShop type in hoffman tactical. Googke sesrch engine. Watch this video....

[@theleadfootgunner6804]

did you figure out where to find the file@@HilltopZombieShop

[@HilltopZombieShop]

yup. thanks@@theleadfootgunner6804

[@rileybrower7736]

Printing this asap. Thanks for all you do!!!

[@raphen90]

Where can I find this stl at ?

[@interdimensionaldrift]

@@raphen90The odd sea 🌊

[@censoredeveryday3320]

@@interdimensionaldrift Sailing the high seas =]

[@calebplumleephotography]

Def wanna see it run with the super safety!

[@michaelabraham9177]

Simple honest truth, not many people can design like you are doing in the 1st place, and of those who can, even less will feel compelled to share, teach, and train their fellow man. Imho we should all be helping our fellow man to the best of our ability. Just my 2c worth.

[@thejoey468983]

hose clamp is genius overall, using basically off the shelf hardware with custom printed components is one of the fastest routes to workable parts with mininmal machining. Im doing similar in several of my own designs. the integrated pistol grip is a big selling point on the KP-15 polymer lower, and it was made an integral piece for exactly the same reason you did. well done!

[@clarkdl19]

For preventing dirt in your muzzle, you can just wrap it in a thin layer of electrical tape and it will blow all of it off before the bullet exits the barrel. A bit simpler and maybe more convenient than printing specific caps. As always keep up the good work.

[@hornmonk3zit]

Or you could just not care because there's no way you can realistically plug up an AR15 barrel enough to cause a catastrophic bore obstruction. If there was a serious issue of guns blowing up in the dirt we'd lose a quarter of our military's recruits in basic training, that's a thing that happens to thin barreled hunting shotguns not tiny .22 caliber cold hammer forged barrels with a .750" OD that are proofed for 70,000+ psi. If you don't believe me you can go watch Military Arms Channel lawn dart an AR into the mud over and over again with no issues.

[@clarkdl19]

@@hornmonk3zit good thing it works on every caliber. Also significant amounts of dirt will affect POI whereas tape doesn't. Stop being so angry my guy I wasn't trying to force you to do anything.

[@TheeHypnotoad]

​@clarkdl19 Black finger covers are perfect for covering the muzzle. Only 2 or 3 cents a pop too

[@DanBowkley]

Finger cots and condoms work really well too. Thin, cheap, and readily available. Heck you can just grab a pair of nitrile gloves and a pair of scissors and get 10 for maybe a couple cents.

[@Elmojomo]

Painter's tape. Doesn't leave a nasty residue.

[@Zanthum]

That grip looks super comfy. Can't really speak to it unless I actually try it but it looks really good. If it feels half as good as it looks it's a good trade for swappable grips.

[@SnackPack913]

All of your improvements make complete sense. Thank you for putting in the R&D work

[@onehundredconcepts]

I've found that with larger projects that I've iterated a lot, it's worth the time investment to rebuild the body and simplify the tree now that you know where you're going and what dimensions need to be parametric vs fixed. Excited about this 4.0 version and ever impressed by your CAD wizardry. Live Free, Jonah OHC.

[@HoffmanTactical]

Yup! Spent a lot of time as well optimizing the design process.

[@P6Tactical]

The stuff legends are made of. Good shit Tim.

[@thomasowens3135]

Gun manufacturers should be clamoring over one another to hire you as a designer. Their loss…

[@lets-get-itgaming8075]

Love the lower and love the PSR upper

[@weld4200]

ANOTHER BEAUTIFUL WORK OF ART ..MUCH LOVE HOFFMAN ...THANKS FOR EVERYTHING YOU DO FOR US MAN .

[@Nedshneebly]

New to your channel, but wow. You are a super cool dude. Your website is awesome as well, thanks for all you do.

[@PrintShootRepeat]

Awesome video. Congrats on the release. Nice upper as well 😉 #teamhoseclamp

[@viteliohernandez]

Awesome, just waiting on filament to come in so great timing. Thank you for all the work.

[@j.bridges2921]

What types of filament does he use in this build?

[@viteliohernandez]

@@j.bridges2921 I think he's using pla +

[@Todd66]

10 pushups while balancing is as impressive as the durability of the print material and band clamp. Again, I’m never not impressed…surprisingly impressed this time. Merry Christmas 🎄

[@rcstl8815]

People who run through forests barefoot are special. This guy goes through life so fast his shoes can't keep up. Pharma disclaimer guys watch this and shake their heads "we aren't worthy..."

[@celiah4658]

That shirt is awesome!

[@savvygood]

I agree! 🔥🔥🔥

[@jdogtotherescue]

An absolute banger dude. I love your improvements that you add to your work and the additions you have made for at home gun manufacturing in general.

[@mrshort2379]

Dude!! That is 🔥! I seriously need to get a 3d printer and learn how to use it. I would print everything you designed! If I had the tools to do so

[@jerodTSI]

The barrier of entry drops every day and you won’t regret buying a printer.

[@tedo3332]

Bambu Labs is putting out great printers that are hassle free.

[@alangliniak9514]

Every free person should have one

[@chadwinter6873]

Love everything about this. Especially your attitude and enthusiasm!

[@wtdconcepts]

Great work as always! You dedication to perfecting the 3DAR Lower is unmatched!

[@nextlvlroy]

Im still rocking the old version, buti will print this as a backup! Thanks!

[@shockburn]

I was able to generate some really good G code in cura after a lot of programming 😁 48hours of printing later I now have a really nice new christmas present that just finished. This design is incredible and you can’t fully appreciate how good it is until you hold one in your hand. The integrated grip was def a move in the right direction for ergonomics. Thank you again for sharing your work, ill be buying some parts from your store or making a donation to help support your work.

[@travistucker7317]

Is cura the only slicer you're familiar with, or what is it that makes you like cura? It seems like the vast majority are on to the litany of slic3r forks now, since cura 5.3 dropped anyway.

[@shockburn]

Ive been using cura since v2.7 so I know the software very well. It has always worked good for me and have been able to fine tune a lot of the prints to get them really optimized. Im sure the other slicers are good to, I just have to learn them. I know Hoffman uses prusa slicer so that would be the next software I will learn. For now cura works great for me so I don’t fix what isn’t broken.

[@travistucker7317]

@shockburn i hear you. Some end up being better for certain parts and such. PS has a feature for running interior bridges from infill to infill to support ceilings inside parts, that's a nice feature to get good upper floors without lots of infill. SS has a fan kickstart time, which is nice. I saw something in BS the other day, but I've barely used it at all. I really should go give Cura another look. I started with it, but haven't even opened it in quite some time now.

[@cvabuck5489]

Absolutely phenomenal work, brother. I ran two of your lowers at GMM3 and might have to give these a shakedown for GMM4. Love the improvements, even if I can't use my PSR grip anymore. Regarding the BAD lever, I love them as they eliminate the need to do the dance of three hands to clear a jam or double feed. I'll let you know on this one, but they'd fit on your old lowers if you straightened them out on a table vise first.

[@jacobmurray3621]

Integrated grips makes sense. Modularity in general is a downside of mass manufacturing. Fully custom integration is the strength of printing and gets rid of downsides that come with modularity.

[@HoffmanTactical]

Correct! With 3D printing, modularity is not needed. If anything, you would have several designs with deferent grips one could choose from prior to printing.

[@georgelstuart]

Looking forward to the 9. Currently running the Hoffman dedicated nine but I had to fabricate a feedramp to get it to feed properly... I will totally try to upgrade to a new design.

[@HoffmanTactical]

Is V1.0 or V1.2? V1.2 fixed the feeding issues, ramps don't really do much.

[@tedo3332]

V1.2 is what I need to print myself. Or do I go with the SL-9?

[@Wearyman]

I have to admit I was one of the people who didn't like the integrated grip concept. I remember calling you out on "X" over it. Now that I've seen it "in action" I think you made the right decision going with the integrated grip. It looks really nice and it contributes to making the overall rifle cheaper because you don't have to pay 30 bucks for a grip! Nice work!

[@bermchasin]

you didnt have to pay 30 bucks for a grip before... you could just 3d print the grip and attach it.

[@mrfawkes9110]

I like the shape you chose for the pistol grip, it looks like a BCM Mod-3. My problem with most integrated pistol grips on ar-15s is that without fail they always use a shoddy design that hasn't been thought out and often is just an A2. The fact that you spent more than 5 minutes thinking about it makes you better than the big brands and the "professionals".

[@kevb5802]

I gotta say that it is hard to find people like you who are detailed oriented and very thorough in explaining... I find that most people are mentally challenged...

[@Anon-greyman]

One time my Hyundai Tiburon Alternator tension bolt broke off while i was on the highway. i managed to get 2 hose clamps around it and it worked great. so good in fact after driving like that for 3 months, i sold that car, and the next owner drove it for 3 years like that. Eventually he traded it in like that. those hose clamps are strangely strong.

[@lililililililili8667]

Every time I need to dick around with hose clamps the damn things strip. Maybe I only ever get cheap garbage hose clamps.

[@leadfoot8593]

If society told you it looks stupid, but society has fallen, who’s stupid?

[@dandexinventor]

From one inventor to another, Good Job!

[@SnackPack913]

That hat gives off some peaky blinders / NRA vibes and I’m here for it

[@Bordendanny]

Very cool man! Good job. You’re quite smart and well spoken for your age. Im super happy it’s open source too!

[@SethJordan-nr8qv]

Great video, I love the new lower! Also your filming is great

[@cda4662]

Bravo Tim you are always outdoing your self, continuously improving I love all your episodes

[@owenminor]

Buy a SL-15 Reinforcement Kit and give it, along with a card that has links to the Odd "Seas". Makes a great gift! And supports his development efforts. Support this guy!

[@tedo3332]

Absolutely!

[@silver4drrx828]

This Superman/Clark Kent having multiple channels having mafucka! I see you and your little easter eggs here and there 😂!

[@Stick3x]

I love the T-shirt. The huge cover up about airships needs to end

[@HoffmanTactical]

Already has, one must only open ones eyes.

[@Isaacmantx]

What an awesome piece of engineering!!! Your skill at this is insanely impressive.

[@gunkid6368]

It's the hose clamp for me

[@adamneil82]

I’m really impressed, very creative and thinking outside the box.

[@calebmeyer2121]

I have a version of your lower I call the hARdware rifle that integrates the grip, stock, and lower, allowing the elimination of the hose clamp and generally strengthening the rifle. Love the new integrated grip, and all of the little quality of life features.

[@interdimensionaldrift]

Would you share your modified version?

[@lililililililili8667]

What version did you modify to make that? Probably requires a custom printer with enough build volume.

[@calebmeyer2121]

@@lililililililili8667 I used the SL-15 3.1. I chopped the design into three parts that bolt together, so it can print on an Ender 3, no expensive machine needed.​ @mastermindx4831 I have it posted on the Odd Sea, just do a little digging and search the name.

[@OnTheScout]

The barefoot sprint was crazy! Wtf!!

[@jmo2321]

Incredible designs...only two suggestions. Maybe design the front left pin plate in such a way that you don't need to mill the slot where the detent piece slots into the aluminum plate. I can see the plates being made with simple 1/4" plate stock, a drill press, saw, and some type of grinder. Also McMaster Part # 6391K615 may be a good alternative to make bushings for the trigger pins. ID of 0.156" ID, .219" OD, 1/4" length. It's also oil-embeded bronze. Could be cut in half for both sides. Those two parts could make it a little easier for those without a lathe or mill that want to make their own parts.

[@HoffmanTactical]

Trust me, I would have if I could ;)

[@th600mike3]

Tim is going to have a vacuum filled aerogel alloy airship one day

[@THYCR3AT0R]

This is a real patriot, running around barefoot and silent in the woods practicing his 2nd amendment rights after helping ensure everyone's 2nd amendment is protected.

[@tacticalted]

Another banger of a vid.

[@johnnylego807]

Such a legend!! Never stop!

[@blooppls]

I can't believe you thought about removing the hose clamp

[@coltonrougeau33]

Printed this bad boy in pa6-cf nylon. Just over 15 hours and it looks phenomenal

[@j.bridges2921]

Do you know what brand/types of plastic he uses for his print?

[@kennyedwards4466]

i cant click your vids fast enough

[@martinstierna6907]

Thank you, you are amazing.

[@Randy_84]

*the hose clamp always makes me laugh*

[@ElliotKing-ci3uy]

You are an American hero

[@MandoEric]

much love brotherman

[@cnw-jd9tt]

Beautiful man thank you for your hard work

[@chadwinter6873]

So is this better than the Orca lower? I want to do a complete build and have been slicing and getting files ready for an Orca build.

[@PresidentMikeJohnson]

yes

[@Michigan4Conservative]

Awesome work, beautiful design. Well done. 👍

[@chokol8cuvrdantz]

Doing the Lord's work

[@ramohino]

Take the front detent spring and put it through the metal plate and steel screw on one side. Make one side with the screws and metal plate and weld together. On the fire control group: Beef it up by; Make it where it take your own proprietary drop in trigger by collaborating with your favorite sponsor. Hell don't think inside the ARbox or outside the ARbox, FREE yourself: Invent a whole new lower with all proprietary drop in parts and only the AR upper will be the only part that can be bought anywhere.

[@HoffmanTactical]

That would reduce accessibility, which would be against the entire point.

[@Ieo9017]

Son, you’re gonna end up with hookworms if you keep playing in the woods barefoot.

[@thegentlemenrat3727]

Bluud just dissed magpull so quick with it

[@dooper173]

Awesome stuff brother, thanks for what you do. On a side note, listening to you talk is like doing like doing cardio. I'm exhausted! Lol Love the excitement

[@REV-1]

Dude!! It’s like discount Lucas Botkin..

[@googenhiemer613]

PSR handgaurd is sick

[@dineauxjones]

Now I'm going to have to get a dual extruder to print that pistol grip a different color. Awesome work, thanks for what you do.

[@ChucksSEADnDEAD]

You could shave down the grip in CAD and give it some locating holes, then print the grip covers separately and epoxy them in place.

[@dineauxjones]

@@ChucksSEADnDEAD that's not a bad idea. In fact I could possibly make plates that go on the sides around the pistol grip.

[@RIFLETHEORY]

You’re basically the trex arms of the 3D printing community

[@fuall6993]

Need some vids with the lower and super safety😊

[@vedrisca]

The explanation for the integrated grip makes me wonder if that's why the KP-15 -- an injection-molded lower -- also sports an integrated grip. I've looked at other polymer lowers that do have cutouts for modular grips, but reviews for those seem to be hit and miss.

[@austinmatney7591]

With plastics you want as much meat as possible. I haven’t really seen any applications where thin plastic is less prone to cracking under similar circumstances. I really need to get a Kp-15 to try one day. Seems legit.

[@MyGraKat2]

I'm excited to see the metal front plate and I like the integrated pistol grip if it is stronger. Thank you for all the work that you put into this

[@burgerlord1297]

Great work as always you are a legend

[@Truthloveliberty]

People rip on this man and lucas botkin because they’re not a buff meat head, yet they both possess far more courage than most of the human cattle in the population today at least they are training for the inevitable and DOING something, keep up the good work

[@sionsoschwalts2762]

You need to write a book on the development of these!

[@scottwatrous]

Very nice. I would say looking at more 2D plate/sheet metal integration isn't a bad idea. Between the easy access to things like laser and water and plasma cutting, there's not a lot of barrier to getting good 2D parts; and so that's where those forward pin brackets make me think that can be lasered without a lot of problems.

[@HoffmanTactical]

You should check out PY2A.

[@garrettt7723]

Design some honeycomb scope caps along with the muzzle caps

[@FLuXX_PwR]

Don't believe his lies. The grip isn't for strength, he's just trying to deprive us of our glorious A2 grip!

[@reuben911]

😂😂😂😂

[@HoffmanTactical]

LOL.

[@nobodynoone2500]

a2 bump is cursed.

[@Schnippen_Schnappen1]

A real human bean

[@tedo3332]

Fah King Stellar! Off to the Odd Sea skipper!

[@80VDualSport]

This guy is chaos focused. I would buy a Super Safety right now if he would sell em.

[@deadlymarmoset2074]

"be sure to get the latest 1.9 version of the stock" - something I never expected to hear...

[@Brucey11]

I love all your designs, hoffman appreciate the work you do! But why arnt you wearing any shoes my boy just letting them dawgs loose out here

[@ProperGanderGaming]

Dianexis would be so proud

[@oldschooldude8370]

I replaced the foregrip on mine with a magpul, threw a romeo-msr on it & easily print 2" rested & 100 yds. Money doesnt buy shooting skill, just improves it. Totally stock setup.

[@philgrazi]

Once the AR is perfected i think a bullpup would be cool

[@nobodynoone2500]

Thanks for keeping on this. I look forward to when commercial lowers are copying your features.

[@adtjr124420]

you should print some boots for the next time you run in the woods

[@PopularVisualWave]

Hoffman, a real human being

[@fuckfuckfuckshit781]

Hero. Thank you.

[@tonymaw8582]

The hose clamp is iconic

[@HoffmanTactical]

Yup.

[@jasont80]

Recommendation: Make the grip officially work with a Talon Grip, or similar grip wrap. Amazing work!

[@TheHasenbeck]

LOVE THE CANIDIDNESS!

[@MaximGhost]

Integrated pistol grip is perfectly fine as long as it has a compartment for Skittles.

[@joesashiify]

You are a genius little brother. 👍🏿👍🏾👍🏽👍🏼👍🏻👍🇺🇸