Sig Sauer RM400-16B-TRD-V2G: Free Floating M-LOK Enhanced Handguard - SIG Matchlite 2 Stage Trigger - 16 Stainless Steel Barrel - Mid-Length Gas System - Moss Green Cerakote Finish - Caliber 5.56MM NATO - Frame Material Aluminum - Frame Finish Moss Green Cerakote - Barrel Material Stainless Steel - Barrel Finish Natural - Magazine Capacity 30 Rounds - Sights Optic Ready - Trigger 2 Stage SIG Matchlite - Overall Length 30.8 in - Overall Height 7.5 in - Overall Width 2.5 in - Barrel Length 16 in - Barrel Twist 1:8 in - Weight w/MAGAZINE 6.5 lb