This Toolcraft Nickel Boron 158 BCG comes with a lifetime warranty and is perfect for any AR15, M4 or M16 Build. Toolcraft carriers and bolts are build to military specifications, also known as "Mil-Spec" and they are known throughout the industry as some of the best.

Toolcraft Bolt Carrier Groups come with a lifetime warranty!

- Mil-spec carpenter No. 158® steel (bolt)
- 8620 Tool Steel (Carrier)
- Mil-Spec Extractor Spring, black extractor insert, Viton O-Ring
- Tool Steel Extractor
- Shrouded Firing Pin
- Mil-Spec Gas Key (4130 Steel) attached with Grade 8 hardware and Properly staked
- Caliber: .223 / 5.56 / 300 Blackout
- Bolt is shot Peened and MPI
- Toolcraft has all BCG compoonents pre polished before being plated by UCT and then post polished for an incredible shine.

SKU#: TOOAUTO-010-C158

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Comments and Reviews (3)

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The lesser bolt?? They are both excellent. 9310 (what earms has) has a small amount of molybdenum, 158 does not. 158 has a little more chrome than 9310. 9310 is a slightly better, stronger bolt (if properly heated), otherwise they are almost identical.

94.99 shipped at

Earms has the lesser bolt rtb has carpenter steel bolt it's not same product.

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