The Sanders Armory Corp .450 Bushmaster MPI Tested Melonite/Nitride BCG offers a 9310 Steel MPI Tested Type 2 bolt and a 8620 Steel Carrier with a Nitride finish that will not flake off, and produces less friction while increasing the life of the BCG. The bolt carrier groups are processed with the QPQ (quench polish quench), a specialized type of nitrocarburizing case hardening which increases corrosion resistance while adding natural lubricity and reduced wear.
The .450 Bushmaster MPI Tested Melonite/Nitride BCG Features:
- 9310 Steel MPI tested bolt
- 8620 Steel Carrier
- Keys are made from 4130 Steel
- Black Nitride Finish on Carrier
- Requires light lubrication for maximum efficiency, easy to clean.
- Includes Crane O ring
- .450 Bushmaster
- AISI 9310 VAR moly, nickel steel
- Enhanced design
- Beveled locking surface
- Carbon/fouling relief area for high fire rates
- Phosphate per MIL-STD-171
High performance bolt machined to exacting standards in one operation maintaining angular positional accuracy to 0.001 degrees. Produced from AISI 9310 Vacuum Arc Remelt material, the highest purity available, then heat treated to the original MIL specification for case and core hardness. The lead lug surface is beveled for reliable lock-up and a carbon/fouling relief area is added behind the lugs for complete reliability under high failure rates.
NO shipping to District of Columbia (Washington, D.C.); Massachusetts; Connecticut; Chicago, Cook County, Deerfield, Highland Park or Aurora Illinois; New Jersey; New York; Puerto Rico; Hawaii; or Canada. NO international shipping, all must be within the 48 Contiguous United States. NO APO/PPO/FPO’s.