- Product Code: 51005
Axem Bolt Carrier Group 5.56 M16 SBN - a bolt carrier group designed for AR-15 type 5.56 NATO systems, featuring an M16-profile carrier and salt bath nitride treatment (SBN); this is a complete AR-15 BCG assembly that includes the bolt, carrier, cam pin, firing pin, and retainer parts.
This assembly combines the added mass of the M16-profile carrier with the wear resistance of the SBN nitride surface. The design takes into account the dimensions of the AR-15 platform and the 5.56 NATO system, making it compatible with .223 Rem and .223 Wylde barrels. The surface treatment ensures smooth moving surfaces, which reduces friction and facilitates maintenance.
The assembly features a high-quality gas key attachment: the gas key is secured with Grade 8 screws and properly staked to ensure a secure connection during use. The bolt is case hardened, shot peened, and MPI/HPT inspected for quality assurance. The extractor has a robust spring and O-ring to improve grip on the case rim, and the SBN-treated surface resists wear and is easy to clean.
Axem Bolt Carrier Group 5.56 M16 SBN - Features:
- Compatibility: AR-15 platform, 5.56 NATO, .223 Rem, .223 Wylde
- Profile: M16 carrier
- Surface treatment: SBN, salt bath nitride (QPQ) for reduced friction and wear
- Carrier material: 8620 steel
- Bolt material: 9310 steel, shot peened
- Quality assurance: MPI and HPT inspected bolt
- Gas key: steel, Grade 8 screws, properly staked
- Extractor: spring and O-ring for improved grip
- Operating principle: compatible with AR-15 direct impingement gas system
- Contents: bolt, carrier, cam pin, firing pin, firing pin retaining pin
- Maintenance: smooth, hard SBN surface facilitates cleaning
Summary: this BCG assembly offers the wear resistance of the SBN surface, the operational reliability of the M16-profile carrier, and the convenience of a pre-assembled package. It is an excellent choice for building an AR-15, replacing an old BCG, or as a spare when seeking a reliable and maintainable solution for a 5.56 system.
Recommended use: suitable for AR-15 5.56 platform builders and enthusiasts looking for a durable, nitride-treated, and reliable BCG assembly.
Product text updated on 9.3.2026.
