What is your experience with AR15s suppressed with a fixed gas block?

[BobT]

I purchased a .308 suppressor at NRAAM last week to use on both my MDRX and my Diamondback DB15. The AR15 has a fixed gas block. I was wondering if I could tap in on your experience with fixed gas blocks on an AR15 using the larger .308 can. I have surfed the internet already to get an education on the subject but the folks on this board seem to have a great deal of practical knowledge on subjects like this. Your considered opinions are greatly appreciated.

 

[Jfal]

I have no personal experience...but I did just watch a video from Classic Firearms where Clint was shooting a .30-cal can on both a .308 (think it was a SCAR) as well as on a 5.56 platform. He then fired the 5.56 with a 5.56-sized can, and the difference was noticeable, but not significant. Meaning the .30-cal can suppressed the 5.56 almost as well as the 5.56 can. He mentioned using the .30-cal can on both to save $$ as a viable option (no idea of legal ramifications here). He had the quick-release muzzle mounts on both rifles (excuse improper terminology).

Can't speak at all to the gas block and whether the 5.56 will be too gassy (or not enuf gas).

 

[TEXASforLIFE]

Most should run over pressure because of the can. If you had a mid or carbine gas system on a 22"+ barrel it might cycle before it could get far enough down the barrel? A 16-20" barrel with a mid or rifle gas system it might not create the op? This is defendant on which ammo you use. 223rem might work better? Cans cause extra pressure and coupled with lower P ammo it might put it in the right curve.

 

[KillerFord1977]

I run a .30 Cal can on my Saint 5.56 rifle with zero issue and zero modifications. Plug and play for my Saint.
The sound suppression difference is minimal to go .308/.30 cal on a 5.56.
I like the .30 cal can because I can run 1 suppressor across my 5.56 & .308 Saints