Sig MPx Gen II, less than 500 rounds fired. Mods include an ILWT 6.5 inch barrel with tri-lug adapter that is threaded, Midwest Industries 6.5 inch MLOK rail, SB Tactical Telescoping Brace, Arisaka Handstop, Magpul Grip, Competition Bolt Buffer, Magpul QD Sling Swivel, Geissele Ambi Charging...