I have a 16" 5.56 barrel that I got from PSA- Carbine gas. I will include the [custom] lo pro gas block, gas tube, and flash hider. It's a 1/7 chrome lined barrel. Only has about 600-700 rounds down the pipe and has run flawless. Never shot it for accuracy but I've killed some coyotes and deer with it and shot a 3 gun competition just fine. I'm selling because I'm going in a different direction with the build. Asking $200 shipped.