Which to suppress

[nw_aggie]

I have a couple of AR uppers that I'm trying to decide between for use with a suppressor. One is a pretty common 16" with a carbine gas system with a fairly light barrel profile, the other a 16" mid length with a heavier profile, measuring .750 at the gas block. I'm figuring on an adjustable gas block on either to help manage gas in the action and dependability while running suppressed or open.

Is there any advantage to one system over the other in this regard?

 

[Charger442]

both of those will suppress about the same, should both run equally well. Your heavier profile barrel will probably resist the moment of adding a can better than the thinner barrel.


Honestly, i run a 10.5" cut down colt socom barrel with fixed front A-post gas block and the thing runs just fine, all the time. runs dirty but thats the way it goes with DI and cans, and backpressure.

16" barrels will both be just fine. i run 5 different centerfire cans and i am just NOW building a 308 AR and im finally including an adjustable gas block.

YMMV

 

[nw_aggie]

That's the input I was looking for. Thanks.

 

[bikemutt]

I've been using SLR Rifle Works adjustable gas blocks on all my DI suppressed rifles with great success. I also have a Syrac Ordinance adjustable block on one rifle. The nice thing about the SLR blocks is they use standard gas tubes; the Syrac requires a straight tube which is darn near impossible to find.

http://slrrifleworks.com/index.php?route=product/category&path=57

 

[tiamat]

Thanks for that tip on the adjustable gas block - I was just about to order a Syrac the other day. Seems the SLR is a tad pricier though, but probably evens out in the end without the need for other proprietary parts.

Edited to add: do the SLR's have a detent metering screw? or you just have to know where you set it?

 

[nw_aggie]

Has anyone with the set screw locking style gas blocks had an issue with messing up the threads where you lock and unlock your adjusting screw when you go from suppressed to un, then back again? Seems like that would make a bad spot on the adjustment screw...maybe you just set it once and run it

 

[Arizona_Mike]

I've been using SLR Rifle Works adjustable gas blocks on all my DI suppressed rifles with great success. I also have a Syrac Ordinance adjustable block on one rifle. The nice thing about the SLR blocks is they use standard gas tubes; the Syrac requires a straight tube which is darn near impossible to find.

http://slrrifleworks.com/index.php?route=product/category&path=57

I own 5 Syracs (Both Gen I and Gen II) and have used standard gas tubes on all of them (except a 7.62 gun on which I am using the non-standard--but still factory and bent--gas tube). I do not believe this is correct.

Are you confusing the Syrac with the PRI?

Mike

 

[DogFish3840]

The Syrac Gen II I just bought for my .458 uses a standard gas tube with a little straightening. I don't think a straight tube will work without bending. It took me all of 5 minutes to get it lined up.

 

[Arizona_Mike]

Gas blocks that use straight tubes are higher so that the tube matches the receiver.

Mike

 

[bikemutt]

Thanks for that tip on the adjustable gas block - I was just about to order a Syrac the other day. Seems the SLR is a tad pricier though, but probably evens out in the end without the need for other proprietary parts.

Edited to add: do the SLR's have a detent metering screw? or you just have to know where you set it?

The SLR blocks have a detent metering screw.

The one Syrac block I used is on a 7.62x39 upper, my 'smith had to straighten the tube for it to work. None of my SLRs required any changes to the stock tubes.

FWIW, I've noticed visible gas leakage (carbon deposits) around the Syrac, none around the SLRs. Who knows if that's more about the rifle than the block though.

 

[Arizona_Mike]

Sounds like the 'smith started with a bent tube that was too bent

I've used .750 and .625 Syracs both Gen I and Gen II and the hole is at the right height for a mil-spec tube.

Mike