Bolt Subassembly:

​Bolt: Carpenter No. 158 Alloy Steel, Shot Peened

MPI Inspected1

Extractor: Shot Peened Hardened D2 tool steel

O-Ring: Mil-Spec

Gas rings (3): Milspec

Coating: Ion Bond (DLC Tribo-41) coating2

Bolt Carrier:

Heavy Duty M16 design

8620 steel, plated

​Gas key: hardened billet 4140 machined, plated

Gas Key Screws,: Grade 8 properly staked (heavy strike). Screws on faceted model may or may not be plated.

Coating: Ion Bond (DLC Tribo-41) coating2

Cam Pin:

8620 steel

Coating: Ion Bond (DLC Tribo-41) coating2

Firing Pin:

mil-spec firing pin made from centerless ground 8740 steel

Coating: hard chrome

Notes:

1. All Toolcraft bolts are MPI inspected, but not necessarily marked MPI. WCArmory requests MPI marked bolts but Toolcraft can not guarantee that all MPI inspected bolts will be MPI marked. Email WCArmory for this disclaimer from the Toolcraft Operations Manager.

2. All BCG's are ordered direct from Toolcraft with the coating applied by Toolcraft's sub-supplier. All coatings are purchased and furnished direct from Toolcraft, and their full warantee is obviously valid.

3. WCArmory has been selling Toolcraft BCG's since 2009.