HELLCAT HOLOSUN 507K Slide Modification.

Modifying the slide to accept a Holosun 507K red dot sight. Working with Trigger Mikes Firearms Training with this install on his personal firearm. These are the steps required to make the Holosun on a Springfield Hellcat.
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Tigger Mikes Firearms Training LLC
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[@ColeDedhand]

Thanks for this guide. I know a mill is the best way to do this but with a dremel and a dial caliper I was able to do it easily enough.

[@jwertel2]

Great job. Since I'm a hack hobby machinist and far from a pro, I left a thousandth or less proud on the rear lugs because I was worried about touching the slide, and the sight still mounts up perfectly with no gap. Everyone with a hellcat should see this. The 507K is a huge improvement over the romeo zero for the hellcat, I made the switch just like this guy.

[@x-ringcustomgunsmithing942]

Thank you. Well done

[@yahuahyahusha364]

This gave me confidence to do it myself, thanks

[@danielbeggs8609]

I'm glad this video popped up for me. I live less than 3mi from you and see your sign all the time. I just got a Hellcat and might be looking to do this exact thing. If I do, I will surely be in touch.

[@MRxMADHATTER]

I am adding the same optic to my Hellcat. (except the one I am getting has the ACSS Vulcan reticle) I ordered an adapter plate. But I have considered doing it the way you did it as well. That will make the optic sit lower and I may still be able to co-witness on the iron sights. One thing I would have done different...I would have taped off the open holes on the slide to prevent shavings from getting inside the slide. You can also make a simple "grip guage" from a piece of wire to tell you exactly how log the screws should be. I wish all these optic manufacturers could come to some agreement on sight mounts and footprints. It would make things so much more simple.

[@jaynawinehouse]

Did you end up doing this? I have same setup and hate that the adapter plate doesn’t allow cowitness with irons. Were you able to get them to cowitness well?

[@MRxMADHATTER]

@@jaynawinehouse Yes. I used a Dremel and took the two pins down flush and shaved a little off the other two so it would sit flat on the reciever. The metal of the reciever is pretty hard so I used a cutoff wheel. You have to be careful to keep from marring things up. I used some Superblue to touch up the bare metal. Looks great! Sits low enough to cowitness. It would have been nice to have a drill press and bottom mill but if you have a steady hand, the Dremel works fine. I had to grind a little and test fit, grind some more and test fit till it was just right. Go slow.

[@truthtalker7774]

What is the benefits of co witness? Wouldn't that make the irons a distraction from the red dot, hence defeating the purple of the dot?

[@MRxMADHATTER]

If the dot fails or if it has moved, you will still be able to use the iron sights.@@truthtalker7774

[@bdkj3e]

Thanks for the detailed breakdown, I was able to mill mine down and get my 507 installed no problem. I did figure out that of you try to mill from the wrong direction towards the rounded off side of the lugs it tends to not dig in and just push it out of the way until it breaks your end mill. Oh well, live and learn.

[@spoolyboi9434]

Great video and info I'm about to do this with a glock and seems to be the same idea, crazy how many people seem to be scared to modify a gun when trying to get answers from Facebook

[@3IN1SDG]

Shouldn't the holes be taped off and covered to keep metal shavings from going into the slide? Pretty sure there are metal shavings that fell inside the slide, even from when you were brushing them away.

[@x-ringcustomgunsmithing942]

I strip the slide parts so everything gets cleaned out after machining anyway. You could if didn't disassemble but chips fly around from the cutter so I just do a quick clean after I work on slides on the mill.

[@workradio1014]

These videos never show the final sight picture of the product. Great job in explaining the process. But as many have mentioned, you need to show the sight picture. I really want to know if any of the stock irons are obstructed in any way or do you have absolute co-witness. The adapter plates promise absolute co-witness, they do NOT. The sights are obstructed. Please consider linking a hosted photo of the final sight picture in the description

[@x-ringcustomgunsmithing942]

Yes you can still see the sights of you do it this way and don’t use an adapter plate. The sights can be seen in the bottom of the window if the optic failed or battery dies. They don’t stick up like a suppressor sight wood but they could be used

[@KendrasEdge757]

Thankfully now you can get a plate from C&H so someone not tool-literate, and not a KZbin gunsmith lol, won’t destroy their firearms. The 407k is much better than any of the RMSc red dots currently available. Although the RMR CC is good, but not for the price! If you’re not mechanically inclined, PLEASE have an actual gunsmith do this job for you! Just got the hellcat pro and I’m going to put the 407K on her too and a TLR7 Sub.

[@x-ringcustomgunsmithing942]

Always try to avoid stacking issues. The adapter plates raise the optic a lot higher which makes back up irons more difficult to obtain. Plus I have seen where the adapter plates come loose and people don't catch it. Keep it simple. Although I have seen people mess this up. I have had one come into my shop where it looked like they used a 6" angle grinder to modify the slide...

[@KendrasEdge757]

@@x-ringcustomgunsmithing942 yeah a lot of people think they’re gunsmiths from watching a couple videos. Typically the issues I see are the customers error not torquing correctly and not using blue loctite or too much. The HOB and being taller than stock sights is corrected with suppressor hight sights or taller sights which trijicon is starting to come out with for proper cowitnessing. Removing material from the slide should definitely be left to a competent smith, but mechanically inclined people can definitely do this job.

[@x-ringcustomgunsmithing942]

Yeah we have provided this service for a lot of individuals sending us the slides from around the country to get it done correctly after them seeing this video.

[@KendrasEdge757]

@@x-ringcustomgunsmithing942 those are the smart ones lol so many people jack up their guns and have no business working on an erector set let alone firearms. However, it keeps work comin in! Lol

[@stevewendling8480]

Your shorter screw length in mm was ?

[@nathankendall7721]

I did this, and the optic sits flush when the screws are loose. But when i torque it down the front of the optic lifts up leaving a small noticable gap.

[@jrodriguez2973]

What size of screws did you use to mount the shigt

[@themilwaukeetoolsjunkiedum9710]

Do you know what size screws are needed

[@jaynawinehouse]

Do irons cowitness well after this?

[@x-ringcustomgunsmithing942]

Yeah you can see about 3/4 of the original sights in the bottom of the window. So they are still usable.

[@mcarlson7014]

By direct mounting instead of using an adapter plate are you able to us the iron sights as backups? I know that with the plate the optic is too high to cowitness

[@x-ringcustomgunsmithing942]

Yes they sit low in the window but you can see the factory irons with the direct mount no adapter.

[@anthonyortiz4538]

Hello can y’all tell me what size screw works… I removed my plate and milled the tabs off as well now my screws are too long hahah

[@artpalma4502]

Does it co-witness with after you milled it as shown in your video?

[@JC-ll3yd]

Holosuns user manual says torque to 15 ft lbs. Any specific reason why you went to 25?

[@nathansdad04]

Is it not possible to modify the Holosun holes instead of milling the slide?

[@x-ringcustomgunsmithing942]

I dont know if you could punch the holes under optic without damaging it for the rear lugs.

[@johnfurious8419]

I wanted this for my hellcat with the 507k x2. can I send you the slide and optic and have the same thing done. Thanks

[@x-ringcustomgunsmithing942]

Yes we can do that.

[@jaimeaguzman]

Does it co-witness?

[@MidwestAtvGroup]

So are you using existing gun screws and only one left side screw needs to be shorten about 1/8" ?

[@x-ringcustomgunsmithing942]

I just did two last week. Used the screws that came with the sight and both needed shortened and fit correctly. Both screws were to long.

[@MidwestAtvGroup]

@@x-ringcustomgunsmithing942 also how much you had to shorten, did you say about 1/8"? Thank you for quick response.

[@x-ringcustomgunsmithing942]

@@MidwestAtvGroup they are all a little different. But usually you cut them down about 3 to 4 threads. I cant remember if its exactly a 1/8 or not. Might be close to that. The left side will allow a little more screw since it doesnt have the extractor plunger at the bottom of its hole

[@doughboy7686]

I wish they would just mention the exact size screw we need to direct mount the holosun 507k to thr hellcat 9mm

[@oscarquintanilla3829]

What should be the total length of the screws needed to mount the 507k into the hellcat?

[@x-ringcustomgunsmithing942]

I don't have and exact number. I grind the ones that come with it to make them fit and not bind on the ejector or bottom out on the hole. Mostly have to just watch the ejector side so it doesn't pinch the spring

[@waleedorra9564]

Can you provide the info for the screw size needed to fit onto the Hellcat?

[@x-ringcustomgunsmithing942]

I don't remember the exactly. But I believe they are a 4mm x .70 thread

[@1kozmosis]

What does it cost to do this and turn around time?

[@x-ringcustomgunsmithing942]

Send me an email to [e-mail] and we can get get a quote to you

[@snakes5506]

I have a slide that take rmsc, 507k, romeo zero, but the foot print of the 507k change a bit from the new 507k x2, can you guys make the 507k x2 fit my slide ? Let me know so i can send it to you guys.

[@x-ringcustomgunsmithing942]

What pistol slide do you have. You can email me [e-mail] it will be easier then sending back and forth in the comments.

[@TheCapi246]

What's the name or brand of that torque limiter used?

[@x-ringcustomgunsmithing942]

That's a wheeler fat wrench

[@LOliver]

If I was to go out and buy screws what are the sizes?

[@x-ringcustomgunsmithing942]

They M4x.7 threads

[@jdrollason]

What kind of bit is that to mill the lugs?

[@x-ringcustomgunsmithing942]

4 flute 1/8" carbide endmill

[@joemiester31]

I live in Ohio and would consider driving there to have this done. Could it be done in a day and how much would it cost?

[@x-ringcustomgunsmithing942]

Possibly depends how busy the shop is. We have been pretty crazy since march of last year so sometimes we cant get on it same day. Also you could mail the slide and we can send it right back

[@jessie38supercharged]

tape your holes people

[@x-ringcustomgunsmithing942]

What holes are we taping? And for what?

[@threebanger]

what sights are you running?

[@x-ringcustomgunsmithing942]

Red dots are holosun 507k. You have to do a few mods like in the video so it will fit.

[@4saxophones]

I think it’s unacceptable that a company like Halcyon doesn’t make their optic so it would fit a shield imprint without any adjustment. Or that they don’t offer a plate that would make it work.

[@x-ringcustomgunsmithing942]

Its more the gun companies making their slides an odd design to keep you buying their products and what they want you using. Browning does similar stuff on threading barrels so you have to buy their muzzles devices and suppressors and not common thread patterns used on everything else

[@marcusstennis2013]

I just purchased a Hellcat and a Holosun 507k. Do you have any contact info? I need my slide done.

[@x-ringcustomgunsmithing942]

Web address is www.x-ringcustomgunsmithing.com all the info is on there

[@sherrischneider2794]

25 in pounds is too tight. Holosun calls for 15in.lbs max Read the instructions first, it works best.

[@danielhoffman2199]

good info but save yourself some time and don't repeat yourself so many times about shaving off a bit from the front lugs.

[@Asidebar]

Using a plate is the proper way instead of removing the posts.

[@x-ringcustomgunsmithing942]

Starts stacking and adds another layer to potentially come loose...

[@YoutubeLovesCowards]

Screw all these gun manufacturers and red dot manufacturers for making everything harder on us. For example: Holosun could have easily make it rmsc/smsc cut but decided to do it 90% of the way and then say "screw you" to all of us and instead made it proprietary. It's ridiculous. Even worse is trijicon, who makes the most expensive red dot and could have easily made it rmsc/smsc compatible. But no, they keep it super proprietary.

[@naughtydog8579]

i used a dremel and cut my screws down, worked great