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Bolt Carrier Group NiB MK1 MOD0

9310 -VS- C158

Properly Heat Treated 9310 May Surpass C158. 9310 Must be PROPERLY heat treated, such as ours is, to accomplish this. Mil-Spec is a standard, Our goal is to surpass it!

Carpenter VIM-VAR 9310 Alloy

(AISI Type 9310)

Nominal Analysis
0.10 C, 0.50 Mn, 3.00 Ni, 1.30 Cr, 0.10 Mo, Bal. Fe

A chromium-nickel-molybdenum carbonizing steel having high harden-ability, good core strength, and superior fatigue resistance.

Carpenter No. 158 (P6) Plastic Mold Steel

(AISI Type P6)
(UNS T51606) 

Nominal Analysis
0.10 C, 0.50 Mn, 0.30 Si, 1.50 Cr, 3.50 Ni, Bal. Fe

Case-hardening mold steel with exceptionally high strength;

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