The Phase 5 Weapon Systems Extended Bolt Release V3 is compatible with all Mil-Spec AR15/M16 receiver sets, including many billet, side charging, and even left-handed weapons. These AR15 Bolt Catches & Releases from Phase 5 Weapon Systems Inc allow access to the bolt release from either side of the firearm, which gives both righties and lefties more options for reloading more quickly and clearing jams more efficiently. One of the improvements in this version of the Phase 5 Weapon Systems Skeletonized Extended Bolt Release V3 is the added grip serrations at the elbow and at the end for more secure operation, especially in cold or wet conditions. Get faster reloads and stay on target with the streamlined Phase 5 Weapon Systems EBRV3 Lever. Specifications for Phase 5 Weapon Systems Inc Extended Bolt Release V3: Manufacturer: Phase 5 Weapon Systems Inc Gun Model: AR-15 Fabric/Material: 8620 high strength carbon steel Cartridge: .223 Remington Size: Small Length: 2 in Hand: Ambidextrous Additional Features: Compatible with all mil spec AR-15/M16 receiver sets Condition: New Features of Phase 5 Weapon Systems Inc Extended Bolt Release V3 Heat treated, 8620 high strength carbon steel, same as a mil spec bolt catch. Secure patented monolithic design, direct replacement component, no screws to come loose. Low profile bolt catch, fits many aftermarket billet upper receivers and most side charging upper receivers. Grip serrations added to elbow and end of Extended Bolt Release lever. Improved magazine follower catch. Larger index finger tab for bolt release. Package Contents: Phase 5 Weapon Systems Inc Extended Bolt Release V3 Roll Pin