Sig Sauer MPX K. I have the stock mpx k 4" barrel and hand guard, as well as a collapsible arm brace. In it current format it has a 6.5" barrel fitted with a three lug adapter capped off with an Anstad Arms Blast wave QD blast shield. Coverd up with an 8" hand guard w/ aluminum hand stop. Back end has a  side folding  Gears Head Works tail hook arm brace.  Vortex Crossfire red dot on the top. Fully ambidextrous controls. Gas piston system, 9mm, crisp flat face trigger. 4 magazines all with Taran tactical base pads. 2x Sig 35rds w/ +9s, 1x Lancer 30rd w/ +6, 1x Lancer 20rd w/ +6. This is a super fun gun for everyone to shoot. $3200 obo for everything