MP5 Build Part 4 - Flat Bending

[@BabyFaceP]

Donate to the build and get your name on the magazine- www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=HPBZEVGGE9PWL&source=url Also- RIVET THOSE IN FIRST

[@anthonywalden3029]

Good Day. I wanted to say that I love all your gun builds on your channel. I really need your help. If you could, could you share a blueprint and what metal you used to make your HK Flat bending jig? Thanks for your response.

[@OGJonnyKamikaze]

Your welds didn't look terrible. I am really excited for you having a home built mp5. You are turning into quite the manufacturer. Lol

[@shawnwillis7561]

For anyone that cant find a flat bending jig, I was able to bend my flat with a piece of unistrut and some screws for guide rods and a 20mm steel rod. I lined up the flat and drilled all the holes to line it up and then I put nuts on the guide bolts on top the 20mm rod and slowly turn the nuts so it pulls evenly through the unistrut. Just got my bolt carrier group in the mail and did a drop test and it goes through great. I've searched the forums looking for dimensions to weld a jig, but couldn't find anything. Saw this mentioned so I gave it a go. I know it sounds janky, but I promise you it works.

[@maggillaguerrilla830]

This man did not lie when he says that he is a terrible welder 😂.

[@colewarren6913]

2 notes on your welding, other than its not bad for your admitted skill level- 1) if you arent running one already, invest in a remote pedal for your machine. It will give you a lot more control over how much amperage you put into your work piece and how quickly, and it will eliminate the need to touch your tungsten to your work piece, leaving your tungsten cleaner and sharper over time. 2) a shade 10 lens cover for your camera will allow viewers to watch you weld and get a better idea of what gets welded where. Love the videos and I'm hoping to conquer an AK74 when my work area is complete

[@tomliemohn624]

Decent video. I've built about 5 of them and I'm a terrible welder. I had a buddy come over and assist with the welding. I had problems with burn through and one think I did, that could help others, was to turn a solid copper rod as a heat sink. It performed two purposes with regards to the cocking tube, one is it assisted with alignment and second it kept the welding process from burning through in case I got a little too squirely with the amperage. I have a few MP5 tools like that which I've done.

[@nickfarrell4129]

You’re living the dream man, can’t wait till I get my garage set up and learn a lot. Hopefully I’ll crank out projects like this some day soon.👍🏼👍🏼👍🏼

[@yourfriendlyneighborhoodra7987]

Looks good to me. I am excited to see how this build turns out also keep up the good work.

[@craighansen7594]

You should check the actual clearance between the bolt carrier and the Id of the receiver. They frequently are a little loose and a simple die that straddles the side grooves of bent flat can draw them in for a even better fit. If you have the front stub of the original receiver, use it for comparison before you cut out the trunnion but after carefully removing the charging handle tube.

[@paulmasten5980]

Fantastic video as always! It's looking good!

[@renelopez2244]

Sweet! Glad this channel popped up! Like and subscribed

[@josephmarino3951]

Great video love how it’s coming out can’t wait to see her finished

[@gregoryhines7]

For the cost of a jig and a flat i was able to get 2 finished receivers. I know its not the same as building and the man knows about it but i just couldnt afford it at the time. Great work P

[@Millie.1965]

Where’d you get your finished receivers?

[@Nordic_Goon]

I really need a straightening mandrel for the Cetme-c.

[@BabyFaceP]

I got your email, just haven’t had a chance to read it or reply.

[@Nordic_Goon]

@@BabyFaceP I apologize for bugging hah, just getting desperate

[@BabyFaceP]

@@Nordic_Goon believe me, I totally understand.

[@ScottBradley-i1m]

I would love to see you build like a ppsh or or a thompson

[@gseyank100]

Hey, can you please tell me the diameter of the center round and the distance in between the two bottom rounds. I would like to make a version of the jig. I have two flats. I started bending one just my measurements of a finished one. I have two or 3 flats I want to bend. Thanks P!

[@shotgunsam23]

i would love to see you build the new plastikov 2.0. If anyone could do it right it would be you. Ivan the troll did put up a full build video on it, but I would still love to see your take on the gun

[@joeolive1010]

Are you considering building a cetme c? I have the same jig and am trying to figure out how to use the jig correctly on the flat, since the ejection port does not allow the flat to lay flat On the jig. Any insight on how to line this up would be extremely helpful!

[@jamesboaz4787]

Why cut the tabs off? Love the build keep us posted.

[@CaptainShuffles]

I'm no expert, but I believe the tabs are sacrificial. After the flat is folded into shape, they would only be in the way, right? I'm also assuming he wants an easier track to weld the cocking tube on too; maybe the tab would interfere with fitting the tube in the first place.

[@shawnwillis7561]

The tabs are only there to align the flat with the jig. After it's bent, they don't serve a purpose and are in the way

[@radiatingfuture1007]

Do you half to get a simu😮auto lower fcu

[@madmike9398]

now i wanna make one...

[@salty_veteran8372]

Makes me want to know the best place to shop for these components and parts kits

[@BabyFaceP]

A quick google search will usually pull up lots of kits, they're just exceptionally expensive.

[@Tgolden069]

Me: I can “build” an AR! You: check this out..... Me: 😮

[@renelopez2244]

Will you build a cetme C in the near future?

[@daviddiffenderfer6963]

Its coming alone very well mr bf

[@daviddiffenderfer6963]

One more thing here your torch do u have foot control for voltage or on the torch

[@shawnwillis7561]

IF YOU ARE DOING A BUILD, DO THE MAGWELL RIVETS FIRST!!!!!! The shell deflector is easy, but the magwell was a huge pain in the ass to do if you bend it first. The magwell rivets wont affect the bend. Trust me

[@kfaposse]

What is the welding set-up?

[@mrwonderful1312]

I need a jig or a flat prepressed. Did you build jig?

[@BabyFaceP]

I have not yet but there is one that's 3D printable. I'm waiting to hear back from a friend on how it works.

[@olddirtyburt7522]

They do have inside shapers that are run through your bended flat and make it correct if there is a mistake.

[@itslife9855]

Sander and paint make me the welder I aint

[@gregoryhines7]

That's how I first learned. Gorilla weld it (strong and ugly) and grind and paint lol.

[@billpoynter108]

What type of tig welder did you use?

[@BabyFaceP]

Old Miller Econotig

[@donovanhocking9350]

Did you end up needing the straightening jig?

[@BabyFaceP]

No, the flat I got ended up being straight. I've been told that it's worth paying extra for the LSC flat for this reason.

[@donovanhocking9350]

Awesome thanks for the response! I'm definitely going to use the lsc flat not worth the headache to me it looked relatively straightforward with the flat and jig you had

[@fourmoreyears1774]

What is the best jig for pressing this?

[@laramiestephenson1143]

Looking good!

[@stevegarcia8570]

Where did you source your jig from, can’t seem to find one?

[@shawnwillis7561]

I checked hkparts .net a little while ago and they had flat jigs in stock. I couldnt find any when I bent my flat so I just used the unistrut method. It worked great for me and its a whole lot cheaper.

[@jaq8657]

What size unistrut did you use?

[@shawnwillis7561]

@@jaq8657 I got a 2 foot precut section from home depot. I think it measured 7/8ths on the inside of the channel. Just look up "mp5 unistrut jig" on Google and it'll show the dimensions in images. Home depot only had 2 sizes. One shallow and one deep. Get the deeper one.

[@Zaucey]

I agree with you… you are a terrible welder lol. Thing is EVERYONE starts out a terrible welder and at least your getting your toes wet! I ain’t ragging on you, I want to see you succeed man! Some tips… first things first, clean the heck out of everything (acetone, dedicated abrasive for that specific material, then acetone again). Those flats are around .060 and for a beginner that has no torch/heat control… that’s a recipe for failure. If you have good fit up, you shouldn’t need any filler to tack your joints. I’d set the machine to 65-70 and full blast that pedal for 2-3 seconds. If you dip your tungsten, do not weld with it until it has been broken off and resharpened! Tungsten grinding angle, grain of grind etc makes a difference! Your fit up was so good that I wouldn’t have even used filler. Fusion weld the joint at around 50-55amps. On something that thin and not having good heat control, I’d fusion weld half an inch then move to the opposite end of the part. Take your time and be comfortable!

[@RJM1011]

Well done ! :)

[@jamesbenisrael9574]

👍

[@PlastiForge]

You should schedule your videos to release at a more normal time, like 10 am or something.

[@thomasault7566]

I enjoy most of your videos but this one felt to sped thru to me. Looking forward to part 5.