Iron City Rifle Works S1 Drop-In Bolt Carrier BCG EVO (NiB) 458 SOCOM
The S1 Drop-in BCG was created for use in real world applications without all the disadvantages of MILSPEC coatings. The EVO coating is the same gen 2 NiB coating used on Iron City’s competition series BCG. Their unique original design results in a flatter shooting system with a noticeable smoother & faster cycle rate & less felt recoil. The advanced coating also makes your cleaning time much easier and faster.
The NiB coating is twice as durable as traditional NiB and has a coefficient of friction of 0.02 with a surface hardness of 82-85 rockwell C. Unlike traditional NIB the EVO has the appearance of chrome and is even easier to clean.
Specifications:
- 458 SOCOM bolt
- Carrier machined from 8620 steel
- Advanced NiB coating-UCT EXO process, twice as good as standard NiB coatings
- Uniquely designed for minimal drag resulting in less felt recoil and flatter follow up shots
- Gas keys properly staked using grade 8 fasteners
- Side charging cut made for non reciprocating side charging upper receivers
