Aim Surplus H4 BCG Review
Initial impressions of the new Aim Surplus H4 BCG.
Carrier
UCT EXO COATED
M16 style (Auto)
Machined from 8620 tool steel
Heat treated to military specifications
Bolt
BLACKNITRIDE Finish
Machined from 9310 tool steel
Heat treated to military specifications
Shot Peened
Ground to meet military required tolerances
MPI (Mag Particle Inspected)
Gas Key
UCT EXO COATED
Machined BILLET 4140
Heat treated to military specifications
Extractor
BLACKNITRIDE Finish
Machined from 4140
Heat treated to military specifications
Shot peened
Firing Pin
Machined from 8640 tool steel
Heat treated to military specifications
Ground to meet military required tolerances
Coated with .0002”-.0003” of hard chrome per MIL-STD-171 1.2.2.2
Cam Pin
BLACKNITRIDE Finish
Machined from 4340
Quench and temper heat treat
Ground to meet military required tolerances
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