AR10 308 subsonic

[Fireresq473]

Long story short. 308 AR10 suppressed not cycling with subsonic rounds. Will an adjustable gas block fix this? I use the gun to deer hunt with regular ammo and wanted to use it suppressed with subsonic ammo for coyote hunting. Any suggestions would be greatly appreciated.

 

[Huskydriver]

It could help yes with the right spring and buffer weight...

 

[msgriff]

An AGB cannot increase gas flow, only decrease or restrict. You can, however, open up the gas port so it will run subsonics, then use an AGB to dial down the gas for supers.

 

[wvfarrier]

This is what I did ^^^

 

[Fireresq473]

An AGB cannot increase gas flow, only decrease or restrict. You can, however, open up the gas port so it will run subsonics, then use an AGB to dial down the gas for supers.

What would that entail? Drilling out the barrel port or something else?

 

[Fireresq473]

It could help yes with the right spring and buffer weight...

Looking at a lighter spring to start now.

 

[mtrmn]

I personally would NOT eff up a good-running AR308 to attempt to make it run subs and then expect it to run like it used to with full power rounds. I'd get another to set up for subsonic only. In any case, keep meticulous notes on every change made, even if it's a dedicated gun, so you can go back through the process to figure out what works and what doesn't. JMO

 

[tekmann2377]

The typical gas port size, and mass of an AR-10 BCG, are not suited to run successfully subsonic without drastic modifications that would make the gun poorly suited for supersonic ammo. My advice is to get a 300 BLK upper.

 

[Fireresq473]

The typical gas port size, and mass of an AR-10 BCG, are not suited to run successfully subsonic without drastic modifications that would make the gun poorly suited for supersonic ammo. My advice is to get a 300 BLK upper.

I'm leaning towards that or a bolt gun specifically for hunting coyotes suppressed.

 

[Fireresq473]

The typical gas port size, and mass of an AR-10 BCG, are not suited to run successfully subsonic without drastic modifications that would make the gun poorly suited for supersonic ammo. My advice is to get a 300 BLK upper.

Thanks for the info. I may just build a 300 BLK upper.

 

[Fireresq473]

Thank you all for your advice. I decided to go with a bolt gun.

 

[hlee]

If it shoots subsonic ammunition to your accuracy requirements, just treat it as a manually operated AR10.

 

[Pappasniper]

I know its obvious , but just run the CH, kinda like running a bolt on a Bolt gun. Adding a AGB may get you there but that is an effort to get the win.

Edit: Bolt gun for the win.

PB