MK1 specifications Barrel SOLGW 11.5a ^2 medium contour "Recce" P3 barrel Carbine Gas System P3 Rifling for superior ammunition forgiveness and extended barrel life Chrome-lined 41v50 or stainless steel material, delivering sub-MOA performance with match ammunition Upper Receiver SOLGW MK1 10.75a ^2 Rail SOLGW Billet Receiver Set Integral trigger guard Enlarged magazine release fencing Enlarged magazine well Optimized bolt catch and matching fencing Altered forward assist placement for added charging handle clearance Rapidly serviceable ejection port door access Continuous picatinny top rail with maximum amount or rail slots Dual stainless steel anti-rotation dowels Broadsword style machined tabs and recesses for MK1 DriveLock rail lockupSOLGW Liberty Charging Handle with small latches Lower Receiver Liberty 2-stage trigger (two-stage, 4.5lbs total) MK1 maritime bolt release SOLGW A5 Receiver Extension (9 Position) A5H2 Buffer SOLGW Stainless Steel Action Spring Badger Ambi Safety Other Information Anodized in black or grey color Rifle ships with one, 30rd Gen3 PMAG (or compliant magazine for applicable locations) Individually built and test-fired Lifetime Warranty and Critical Use Replacement