Cryptic Coatings 9mm AR-15 Bolt Carrier Group - Mystic Midnight

A 9mm bolt carrier group designed from the ground up for 9mm — not adapted from a rifle platform. The Cryptic Coatings 9mm BCG uses a 4140 heat-treated heavy-duty external extractor specifically engineered for the 9mm case geometry, a removable counterweight, and an aluminum guide key with self-locking bolts, finished in Mystic Midnight for GLOCK and Colt-style magazine 9mm AR builds.

The Cryptic Coatings 9mm Bolt Carrier Group is a 9mm-specific BCG for GLOCK and Colt-style magazine 9mm AR builds, machined from mil-spec 8620 aircraft-quality steel with a 4140 heavy-duty external extractor, removable counterweight, and self-locking aluminum guide key, finished in Mystic Midnight.

Four features define the Cryptic 9mm BCG's design advantage. The heavy-duty 4140 heat-treated external extractor is purpose-designed for the 9mm case rather than adapted from a rifle extractor profile, providing reliable extraction across the full range of 9mm load pressures and headspace variations that 9mm pistol-caliber ARs encounter with mixed commercial and duty ammunition. The threaded extractor pin allows field removal of the extractor without specialized tools — a serviceability advantage on a blowback or delayed-blowback platform where extractor replacement is a more common maintenance need than on a rotating-bolt rifle. The removable counterweight via threaded set screw allows the shooter to tune the carrier's mass for their specific buffer and spring combination, optimizing cycling behavior across different setups. The aluminum guide key with self-locking bolts eliminates the staking requirement, simplifying assembly and replacement while maintaining secure key retention.

Compatible with GLOCK and Colt-style magazine 9mm AR builds and drop-in mag well adapters. Compatible with mil-spec buffer and spring assemblies. Dust cover compatible. Total weight: 13.5 oz.

8620 steel carrier, Mystic Midnight finish. 4140 external extractor, threaded removable pin. Stainless steel firing pin with spring. Removable counterweight.

Built for 9mm AR-15 builds running GLOCK or Colt-style magazines where a purpose-designed 9mm BCG with field-serviceable extractor and adjustable counterweight is the right choice.

By Cryptic Coatings. Standard Cryptic Coatings warranty applies.