Text EIGHT3TWO 7SEVEN6 0EIGHT1FOUR for fastest response. I have PSA 13.7 Sabre Upper with a Quad Rail and JMAC 4 prong Keymo mount thats pin and welded for legal length. 556 with a 1/7 twist. No BCG/CH. All from PSA. Also has an adjustable mid length gas block. Less than 100 rounds through non suppressed, never shot suppressed, extremely soft shooting. $500 firm takes it all, will include some UTG rail covers as well. No trades, price is firm. Can meet anywhere in San Antonio.