Thread: question re a 300 blk or whisper

Originally Posted by Tertle

Now silly question time, how well does the 300 or whisper cycle on subs?

Here's mine. 300 BLK but i had to do some work to get it cycling. Took all the internal weights out of the carbine buffer in the end, and drilled my gas port out a bit. It's carbine length gas, so with a sub-sonic load, there's not a lot of pressure at the port.