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Posted: 12/20/2016 9:22:25 PM EST
OK, I have a large 9mm suppressor I used (a lot) on an MP5 and Mac11 in full auto. Worked great no issues.

I just realized due to downsizing I no longer have anything that uses 9 MM other than perhaps a handgun deep on the safe and the suppressor is way too big for a handgun anyway.

So is this a possible use on an AR upper shooting 223? I know the bullet will fit through but will it actually do much suppression and will the increased velocity cause issues?

If the answer is no, or even yes, what are good semi-auto carbine style 9mm hosts for this? I don't feel like going through the hassle of SBR or the like so something off the shelf.


Link Posted: 12/20/2016 9:29:33 PM EST
It may take a few rounds, but won't last long. 9mm ar platform, cz scorpion rifle, and Sig MCX are good choices.
Link Posted: 12/20/2016 9:40:21 PM EST
So the 223 would be too high pressure for the 9mm can? OK, I can live with that.

I looked up some of your suggestions. If you mean the Sig MPX I am liking that. Can't find any in stock in my area but it might require and order. The CZ seems to have a faux suppressor on it and removing it might require doing an SBR on it from what I could read.

Really like the Sig. Thanks

Link Posted: 12/20/2016 9:50:30 PM EST
[Last Edit: 12/20/2016 9:53:58 PM EST by GunDisaster]
Yeah the pressure of the rifle round is much much higher than that of a pistol round. It would most likely blow up your 9mm suppressor. Unless it's a older all steel foot long 9mm suppressor, then maybe it could handle it, but still wouldn't recommend it. I would get a proper rifle can for it.

You can shoot a 9mm through a 45acp suppressor because both the size of the bullet is smaller and the pressure is lower. You can shoot a 5.56mm round through a 7.62mm suppressor because again the bullet is smaller and the pressure is lower. You can shoot a subsonic 300BLK round through a 9mm suppressor, smaller bullet, around the same pressure. You can't shoot a supersonic 300BLK through a 9mm suppressor because the pressure is just too great.

You have to take these things into consideration. Both the size of the bullet and the amount of pressure the suppressor can handle. 

I would probably recommend going with a pistol type with Sig brace if a SBR is a no go. That way it's still pretty much a SBR, short barrel and sort of a stock, but no NFA paperwork. Maybe a Mp5 pistol clone with Sig brace stock. Or maybe go with an AR-15 pistol with Sig brace stock in 300BLK and only shoot subsonic ammo through it. 
Link Posted: 12/20/2016 10:08:32 PM EST
Thanks. Yeah, it IS a big can. Oh hell let me take a photo.'

It feels pretty solid and maybe steel. Don't know. But I don't mind building a 9mm host for it. Heck, what am I thinking? I have a registered M16. I can just buy a second upper in 9mm and block and away it goes.

Hmmm, need to look around.'

Link Posted: 12/21/2016 9:26:33 AM EST
Care to name the can and manufacturer, I can't make it out in the photo? There are a few 9MM cans that are 223 rated (Mystic/Mystic X being the most popular). I'd ask the manufacturer if it isn't explicitly stated on their website.
Link Posted: 12/21/2016 10:23:40 AM EST
build a 9mm AR
Link Posted: 12/21/2016 1:59:15 PM EST
Can has SJM Scottsdale, AZ 9mm stamped on it with a serial number. That's it.

I bought it from the Scottsdale Gun Club years ago when they were called "The Armory". Just found this thread:


Built like a tank. Maybe if I wander over the the Scottsdale Gun Club Shane will be around and can tell me if it's tough enough for 223. Otherwise I'll likely go the 9mm AR/M16 route.

Link Posted: 12/21/2016 2:01:30 PM EST
I know a guy used a TiRant 9 on a 5.56

Lasted all of one round.
Link Posted: 12/21/2016 3:22:53 PM EST
You could probably get away with using it on a 300BLK

A 9mm upper for the M16 would be my 1st vote though

A 9mm 16+" carbine with a large can probably isn't going to "tickle your fancy"

If you don't want the hassle of a SBR, I'd recommend MP5, Sig MPX, Scorpion, etc. set up as a pistol with a brace.

You could also setup a 9mm AR pistol, and use the upper for the M16 as well.
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