Odin Works AR-15 Low Mass Bolt Carrier Group Features The Odin Works Bolt Carrier Group is built around a bolt machined from case hardened 9310 steel with all bolt components finished in black nitride for added wear resistance and reduced friction during cycling. The bolt itself is held to true mil-spec dimensions with external surfaces CNC ground after heat treatment to ensure a precise fit within the carrier and barrel extension. The extractor is made from 4340 steel to mil-spec standards and paired with a spring and O-ring combination for reliable extraction under a wide range of conditions. Every bolt is magnetic particle inspected and high pressure tested giving shooters added confidence in the part s strength and reliability before it ever reaches the field. The carrier is constructed from case hardened 8620 steel and weighs just 9 ounces reducing reciprocating mass compared to a standard carrier to help soften recoil impulse and smooth out the cycling of the action. This advanced low friction coating minimizes the need for heavy lubrication which can help keep the action running cleaner between maintenance intervals. The gas key is machined from 4130 steel and attached with Grade 8 hardware properly staked into a milled valley to ensure it stays correctly positioned under repeated firing. The Odin Works Low Mass Bolt Carrier Group is available for sale at GrabAGun for AR-15 owners looking to upgrade reliability and reduce felt recoil in their .223 5.56 or .300 AAC Blackout builds. Odin Works AR-15 Low Mass Bolt Carrier Group Specifications Manufacturer: Odin Works Type: Bolt Carrier Group Material: Steel Finish: Black Nitride Compatible Hosts: AR-15 (.223 Rem / 5.56 NATO / .300 AAC Blackout) Weight: 9 oz Available At: GrabAGun