Threaded (Rifle Length 0.750 Gas Block Journal) (REMOVED IN BUILDERS KIT) Tunable Gas Block (REMOVED IN BUILDERS KIT) Rifle Length Gas Tube + Pin (REMOVED IN BUILDERS KIT) Non-Tunable Buffer Weight (REMOVED IN BUILDERS KIT) Gas System The Raven 5.56 caliber system uses a DI (Direct Impingement) gas system which is one of the most widely used extremely reliable, tried and tested systems in the world. This Mid Length Upper and Magwell are compatible with our future kits for .22LR (Same Barrel, only change BOLT) .410 Gauge 6.5mm Grendel 7.62x39mm +More*

Ambidextrous safety, bolt catch and mag release, and accutrigger and top charging is an additional $75 to $100**
Specifications: 5.56 Barrel twist rate: 1:8 Parts Included: Mid Length Magwell - Fits 5.56 (PLATINUM & GOLD) Ambidextrous Magazine Release Kit - Enhanced Right Hand Magazine Release Button (PLATINUM ONLY) - Enhanced Left Hand Magazine Release Button (PLATINUM ONLY) - Enhanced Ambidextrous Crosspin (PLATINUM ONLY) - Enhanced Ambidextrous Crosspin Roll Pin (PLATINUM ONLY) - Magazine Release Spring (PLATINUM & GOLD) - Basic AR15 Right Hand Only Magazine Catch / Release (GOLD ONLY) Ambidextrous Bolt Catch Kit - Right Hand Bolt Catch / Release Button (PLATINUM ONLY) - Standard Button Retaining Pin (PLATINUM ONLY) - Left Hand Bolt Catch / Release Button (PLATINUM ONLY) - Standard Button Retaining Pin (PLATINUM ONLY) - Bolt Catch Plunger (PLATINUM ONLY) - Bolt Catch Plunger Spring (PLATINUM ONLY) Mid Length Caliber Upper Receiver (PLATINUM & GOLD) Raven Med Length Bolt + Carrier Complete - Bolt Carrier (PLATINUM & GOLD) - 5.56 Firing Bolt (REMOVED IN BUILDERS KIT) - Ejector (REMOVED IN BUILDERS KIT) - Extractor (REMOVED IN BUILDERS KIT) - Firing Pin (REMOVED IN BUILDERS KIT) - Firing Pin Retaining Pin (REMOVED IN BUILDERS KIT) - Cam Pin (REMOVED IN BUILDERS KIT) - Gas Key (REMOVED IN BUILDERS KIT) 5.56 Barrel