Lets talk DI suppressor hosts

[Deflagration]

We know there are a multitude of variables that come into play in having a direct impingement suppressor host that can run well with and with out can. Examples are below.
- Barrel length
- Adjustable gas block
- Gas system (pistol,carbine,midlength,intermediate,rifle)
- Gas port size
- Gas tube OD
- BCG (i.e Surefire)
- Buffer weight/Type
- Spring
- Receiver extension length (i.e A5)

There must be some combination of above that is MOST optimal for use with and without can. There will always be a give and take. A system that is perfect with suppressor on, will sacrifice some reliability with suppressor off and vice versa. With that said, there is some combination that gets closest to being optimal for both situations.

People have tried various combos and have had success. Pew Science has shown some incredible results with 11.5 Mid-length uppers. Sound signature and recoil impulse are incredible with that set up.

Are there "turn key" factory set ups that will do the job decently well? MK18 has been tried and true and DD has changed gas port sizes for a few years now.
I get that building is attractive to some, however I find value in ready to go factory systems that will work right out of the box.

Anyone have any other experiences with factory DI systems that are good suppressor hosts without sacrificing reliability without suppressor?
BCM 11.5 Carbine length?
Geisselle, KAC, LMT?

 

[Gasgun]

The key is a proper sized gas port and a low back pressure suppressor.
Everything else is a Band-Aid trying to fix those two issues.
The US military has been issuing SureFire and KAC suppressors for years.
The M4, MK18, etc. all run suppressed or not.

After years of experimentation with various types of rifles and suppressors from various manufacturers I have settled on rifles from Colt, LMT and Knight’s Armament. Suppressors are the SureFire SOCOM RC’s. They all run reliably.

I have one gun (MK18ish) that has the Vltor A5 RE and buffer. I haven’t noticed a significant improvement over the H3 buffer and Colt RE on that gun.

 

[Jcmar15]

Check out a properly built factory gun ie BCM, SOLGW, LMT, SIONICs or KAC. There are other good ones too but those are the first the come to mind. I’ve run the first 3 suppressed a lot and haven’t had issues.

Gas port size, a properly built BCG and the correct buffer system are pretty much the make it or break it.

 

[nn8734]

Apart from the ones already mentioned, my Daniel Defense carbines function just fine with or without a can.

 

[kyzim311]

OSS suppressors currently will have the least backpressure and have very little impact on the functioning of a D.I. gun. There are not the quietest, and they can have some muzzle flash, but there are tradeoffs with everything. The recommendations above are also good.

 

[Kadams1563]

I will say my Omega .30 cal has a ton of back pressure.

right now I have a 11.5 rosco build with a adjustable gas block. It runs 100% suppressed. Without the suppressor it won’t even eject the spent round. I have to adjust the gas block quite a bit to get it to run unsuppressed and then the recoil is harsh (compared to running suppressed only setting).

I never thought a .30 cal suppressor would add so much back pressure.

if I was to buy another can I would go with a sure fire RC2 or an OSS.

 

[RTV]

KAC is very well known for the phenomenal gas system and properly being tuned to just run with/without can.
If you are looking for a gun within their barrel lengths and have the budget. You cannot buy a better factory fighting rifle.

I personally went with Triarc because they have a 13.9 and a 12.5 which KAC does not. they have a very good reputation for having smooth reliable guns. They also don't have proprietary parts like KAC doss if that matters.
I cannot speak yet however of if they live up to their hype as mine are still on backorder its a 14-16 week backorder however from everything I have read from people who have them as well as the reviews by guys like garandthumb they are phenomenal.

Use code goonlife for 5% off if you go Triarc.

 

[BadKarmaIII]

Fantastic results with the Innovative Arms W.A.R. Upper, even with conventional cans and full auto.
Have your cake and eat it too!

 

[db2000]

I will say my Omega .30 cal has a ton of back pressure.

right now I have a 11.5 rosco build with a adjustable gas block. It runs 100% suppressed. Without the suppressor it won’t even eject the spent round. I have to adjust the gas block quite a bit to get it to run unsuppressed and then the recoil is harsh (compared to running suppressed only setting).

I never thought a .30 cal suppressor would add so much back pressure.

if I was to buy another can I would go with a sure fire RC2 or an OSS.

I run with and without (although almost always with) an Omega 30 on a BA 12.5” govt profile barrel without any problems. Geissele low profile super has block. All kinds of ammo from 55 fmj to 77 hand loads. There’s a good deal of gas back but never any problems. Semi or FA. It’s a Surefire FA BCG and spring/buffer system for suppressed 5.56. Maybe that’s part of the key to it always functioning.

SF-OBC-556 | Optimized Bolt Carrier Group for M4/M16/AR-Variant Rifles & Carbines | SureFire

Invented by Jim Sullivan, one of the original designers of the M16, the SureFire Optimized Bolt Carrier (OBC) doubles the reliability of any M4/M16/AR variant weapon system during suppressed and suppressed firing.

www.surefire.com

 

[Kadams1563]

I run with and without (although almost always with) an Omega 30 on a BA 12.5” govt profile barrel without any problems. Geissele low profile super has block. All kinds of ammo from 55 fmj to 77 hand loads. There’s a good deal of gas back but never any problems. Semi or FA. It’s a Surefire FA BCG and spring/buffer system for suppressed 5.56. Maybe that’s part of the key to it always functioning.

SF-OBC-556 | Optimized Bolt Carrier Group for M4/M16/AR-Variant Rifles & Carbines | SureFire

Invented by Jim Sullivan, one of the original designers of the M16, the SureFire Optimized Bolt Carrier (OBC) doubles the reliability of any M4/M16/AR variant weapon system during suppressed and suppressed firing.

www.surefire.com

My BCG is a LMT enhanced, Vltor A5H2, Sprinco green.

it all works well but got spoiled by the very little gas’s it needs to run suppressed. To turn it up to make it work unsurpassed just isn’t near as soft shooting.

 

[Deflagration]

DD also makes a 11.5 in upper, (V7 s), I wonder how it compares to BCM 11.5 in terms of gassing..

Another odd thing in the industry is that it seems like 95% of companies still offer government profile barrels for no functional or logical reason.
A continuous taper profile would be advantageous not only in handling but also POI shift from a suppressor.
BCM offers ELW profile which is a nice option, thicker where bending moment is highest when compared to government profile which is the opposite...

 

[GUNNER10]

The key is a proper sized gas port and a low back pressure suppressor.
Everything else is a Band-Aid trying to fix those two issues.
The US military has been issuing SureFire and KAC suppressors for years.
The M4, MK18, etc. all run suppressed or not.

After years of experimentation with various types of rifles and suppressors from various manufacturers I have settled on rifles from Colt, LMT and Knight’s Armament. Suppressors are the SureFire SOCOM RC’s. They all run reliably.

I have one gun (MK18ish) that has the Vltor A5 RE and buffer. I haven’t noticed a significant improvement over the H3 buffer and Colt RE on that gun.

This,

The issues that people find with running a DI suppressed stem from the wrong tool for the job. Most of the issues are the result of putting a high back pressure can on rifle that may be over gassed to begin with.

If one wants to suppress a 10.5 DI, i would advise getting a can that was designed to be ran on such weapon, don't buy a can that was designed for max sound suppression from say a bolt action.

 

[Nimothy]

I have a factory 11.5” bcm lw rifle it runs pretty well supressed, I don’t eat of gas with my aac 556sd which lives on it all the time. I also run a h3 with springco blue spring in it though. And the factory bcm block. I have buddy that has a faxon 11.5 mid he runs a chimera on, that rifle is smooooth as butter but it also has a superlative block. It’s one of the absolute nicest shooting parts rifles I’ve ever fired. I really like it, idk if it runs unspressed though, I’ve never seen It without a can, I’m 80% sure his chimera is direct thread. My omega typically lives on a 12.5 noveske barrel with an adjustable Odin works. I bought this upper complete used here on the sight, It’s balances well, accurate, and I don’t notice any more gas with it than my 11.5 even though folks say the omega is a high back pressure can. My dd barreled mk18 clone gun pretty much spits in your face (insert sexual reference here*) with a can. Now if I ever build another upper I think I’d try and find a 12.5 mid with a superlative gas block. I think that could be the best all around supressor host gasser. Also, I don’t know what y’all think about those gemtech supressed carriers, but I have one in my heavy .936 ar10 and it’s awesome. You just pull it out and turn a screw, all the problems are solved. I’ve had it in there for about 1k rounds seems to work pretty good, but it doesn’t have forward assist serrations so when it gets dirty you’re pretty much done. (300 ish rounds)