02-13-2024, 12:03 AM
If the gas block is aligned with the port, the answer is not enough gas volume/pressure for the BCG/buffer/spring.
You CAN run a carbine length spring and buffer in a rifle length buffer tube with a spacer to make up for the difference in buffer tube length; I do one one of my lowers.
A rifle buffer usually weighs 5oz vs a carbine buffer at 3oz, but there are others. If you can't make it work with a standard gas block (or Superlative 18 clicks out from fully closed) and carbine buffer and spring, there simply isn't enough gas.
You CAN run a carbine length spring and buffer in a rifle length buffer tube with a spacer to make up for the difference in buffer tube length; I do one one of my lowers.
A rifle buffer usually weighs 5oz vs a carbine buffer at 3oz, but there are others. If you can't make it work with a standard gas block (or Superlative 18 clicks out from fully closed) and carbine buffer and spring, there simply isn't enough gas.