OTR-15 Billet Lower Receiver and Upper Handguard: 12.5" ODIN Works M-LOK O2 Lite Barrel: 16" 223 Wylde Stainless Steel Match Grade Barrel Gas System: ODIN Works Tunable Gas Block, Mid-Length Gas System Bolt Carrier Group: ODIN Works 223 Black Nitride BCG Stock: B5 Bravo Stock, 3oz Buffer paired with Stainless Steel Carbine Spring and Ambi-Sling/QD Back Plate Lower Receiver Equipped With Following Parts: Magazine Release: eXtended Magazine Release Gen3 Safety: ODIN Works Ambi-Safety Grip: B5 P-Grip - Black Bolt Release: ODIN Ambi Bolt Release