I have a BRN 300blk on a PWS Mod2 (newer) lower. It has a buffer tube and spring but that’s just to have the brace. This is self contained bolt so you don’t have to have anything on the back. I also have a pic rail for the backplate for if you want to add in a skeleton style brace. Cloud defensive light with rail button, surefire “blast defuse”, emissary hand break and fixed sights. Unfortunately I can’t do trades. DL required with a bill of sale. Text is the best way to get ahold of me.