Thread: Trouble getting 300 Blackout to shoot and cycle subs

No such thing as over gassing with direct impingement as the carrier moves away from the tube venting the gas anyway.

You should have an adjustable gas block and pistol length or shorter gas system to reliably run both subs and supers.

Short of changing your gas system I would recommend increasing the gas port to the internal diameter of the tube. You can't get any more gas through than the diameter of that tube anyway.

Remember when testing subs to start high then work your way down. When you have your desired load fire a single round in the mag to see if the bolt locks back, this will indicate if you have sufficient gas to work the action.

Other fixes include removing one coil at a time from the buffer spring until this works and changing to a lighter buffer. Google h and h2 buffer weights to speed up or slow your bolt.

Good luck.

Originally Posted by 300_BLK

No such thing as over gassing with direct impingement as the carrier moves away from the tube venting the gas anyway.

You should have an adjustable gas block and pistol length or shorter gas system to reliably run both subs and supers.

Short of changing your gas system I would recommend increasing the gas port to the internal diameter of the tube. You can't get any more gas through than the diameter of that tube anyway.

Remember when testing subs to start high then work your way down. When you have your desired load fire a single round in the mag to see if the bolt locks back, this will indicate if you have sufficient gas to work the action.

Other fixes include removing one coil at a time from the buffer spring until this works and changing to a lighter buffer. Google h and h2 buffer weights to speed up or slow your bolt.

Good luck.

Hi thanks! I'm thinking of increasing the gas port, do you have any suggestions on loads?

Originally Posted by Burgs12

Hi thanks! I'm thinking of increasing the gas port, do you have any suggestions on loads?

PM'd you

good reading and videos . .. sure makes a bolt gun in the BLK look an easier proposition