You can keep the noise reducer, and I’m running mine as a CMMG ‘dialable’ piston set up. Had to remove a whole loop from the buffer tube spring, but it runs like a sewing machine now. But for one-handed shooting, the Bushmaster 5.56 pistol in carbon fiber is the cat’s meow.
Short, fast, penetrates first layer (perp or wall) but not second layer of sheetrock, minimal worry of running out. Works for us!