KAK Industry K-SPEC Enhanced AR-15 5.56 NATO/.300 Blackout Bolt Carrier Group Side Vent Sand Cuts Chrome Silver. The K-SPEC is a truly plug and play BCG that will accommodate whatever configuration your mission requires. Specifications for KAK Industry K-SPEC Enhanced AR-15 5.56 NATO/.300 Blackout Bolt Carrier Group: Manufacturer: KAK Industry Caliber: .300 AAC Blackout 5.56mm Gun Make: AR Platform Gun Model: AR-15 Hand: Right Weight: 11.5 oz Condition: New Features of KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group Dual Ejectors Angled Carrier Rail Cuts Downward Gas Ports Full Auto Profile Package Contents: KAK Industry KAK Industry K-SPEC Enhanced AR-15 5.56mm/.300 AAC Blackout Bolt Carrier Group What firearm models does the manufacturer say KAK Industry K-SPEC Enhanced AR-15 5.56 NATO/.300 Blackout Bolt Carrier Group is compatible with? The manufacturer suggests that KAK Industry K-SPEC Enhanced AR-15 5.56 NATO/.300 Blackout Bolt Carrier Group is compatible with AR-15KAK Industry MO-425-3305-007: K-SPEC Enhanced AR-15 5.56 NATO/.300 Blackout Bolt Carrier Group Side Vent Sand Cuts Chrome Silver