And lo and behold it has be coupled with DPMS parts, Oracle upper, Daniel Defense upper, even a PSA upper. Somehow, for some odd reason my poly is junk. Point is, I have a JMT LOWER THAT IS POLYMER THAT I MILLED MYSELF AND IT HAS RUN THOUSANDS OF COURSE ROUNDS AND LIVE REAL LIFE...
The .300 Blackout has the advantage here. The .300 Blackout has a good reputation for cycling the bolt reliably when usingsubsonic ammoand when used in short barreled rifles. Additionally, it doesn’t suffer nearly as big of a drop off in performance as the .308 Winchester or .223 Reming...