Build from existing suppressor?

[intheATL]

Hello learn-ed ones,

After reading up, I think the answer is going to be no... But...

After shooting my OSS 556 suppressor, I now hate my other one. The blowback is just atrocious. (I do have an adjustable gas block tuned way down). Could I use this one as a basis for manufacturing my own suppressor? I would love nothing more than to open the suppressor up, perhaps modify the baffles and add some venting to the front face (please don't laugh!).

I cannot seem to find anything in the Form 1 area that speaks about using an existing suppressor, and I'm not sure if Form 4 would allow it. I also do not want to even approach doing anything illegal.

I know that this may sound pretty silly, but I am afraid that this might just end up being a $900 paper weight because I hate using it. Of course, maybe it is just a really bad idea to even consider what I am thinking. There are probably numerous reasons not to do this. I guess manufacturer liability would be one... I just can't get over the difference between the two that I own!

I'm probably (like usual) missing the obvious.

Thanks!

 

[MachIVshooter]

There's not a good avenue for doing what you want to do yourself without being an SOT.

 

[intheATL]

Appreciate your quick response! Would there be a legal way to have someone such as yourself do it for me? I'm guessing that would open up a whole new can of worms...

Looks like I'll have to do what I can with mitigation around the charging handle/forward assist - but boy, does this thing gets filthy in just a few rounds! Thanks again.

 

[MachIVshooter]

Anything can be repaired/recored/altered by an 07/02 or 10/02 as long as:

-original primary tube is not replaced
-can is not lengthened ("minimal" shortening is permitted for repair purposes)
-caliber is not changed

*Overboring to mitigate back pressure or baffle strike concerns does not constitute changing caliber.

What suppressor are you dealing with?

 

[intheATL]

It's an AMTAC 556CQBM over-barrel.
https://amtacsuppressors.com/suppressors/cqb-2/

 

[MachIVshooter]

It's an AMTAC 556CQBM over-barrel.
https://amtacsuppressors.com/suppressors/cqb-2/

Oh, yeah. Yet another monocore, and a simplistic euro design one. That core style does just about nil for suppression. Of course, OSS cans aren't that great on SPL reduction either. There's a balance between acceptable back pressure and enough restriction to actually suppress, and OSS went too far the other way. The newer ones are definitely better, but I'll gladly tolerate a little more carbon in the receiver for better suppression.

At any rate, reflex designs are pretty much a waste of space, and while ATF doesn't have an official position on how much shortening is allowable, I personally won't lob more than an inch unless there's legitimate, demonstrable damage requiring more, so while it could be made more effective, you'd still end up with a nearly 9" long 5.56 can. Could do a shorter reflex section (up to ~2" can have some effect) with a large blast chamber forward of it and an efficient conical baffle stack, end up with something that's ~6-1/2" forward of muzzle, which is in the range of a lot of good modern 5.56 suppressors. My 5.56 models are all 5-7" long.

 

[intheATL]

Awesome info! I had high hopes that the blowback would be low in this suppressor, I read somewhere that purpose of the chamber behind the muzzle was intended to reduce it. It’s a good 4 inches. (16” mid-length gas barrel)

I’ll try to add a picture. The website shows nice pictures of the core.

 

[intheATL]

Down the muzzle end.

 

[intheATL]

One more.

 

[intheATL]

Mr MachIVshooter, I just spent some time looking at a couple of your videos - awesome! I'm not a machinist, but I even enjoyed the one on the Pedersen.

So what do you think? Your earlier thoughts sound like a redesign. Is there something fairly straight forward that could help this suppressor? Over boring for back pressure mitigation along with some simple modification internally? Is there too little distance forward of the muzzle to vent the front OSS style? Maybe it would be too much re-inventing.

It's very encouraging to learn that people do have their suppressors modified, I had no idea.

Thanks for listening to a guy with only two suppressors and little experience.