Surface treatment per qq-p-416, type 1, class 3 for top plate only; manganese phosphate, type m, or zinc phosphate, type z, per mil-p-16232, class 1, except for top plate; top plate=aisi 01, hardness rc26-32; bolt carrier=8620, cold drawn stress relieved steel, brinel hardness 217-229; bolt= carpentersteel 158, brinel hardness 195-235; ejector pin=titanium; locating pin=aisi 01, hardness rc26-32
An item consisting of a bolt carrier, a breech bolt, a top plate, and a locating pin. It replaces a breech bolt in a rifle or machine gun to alter the operation of the weapon from gas to blow-back so that low-powered practice ammunition may be used. It is not intended for non-practice usage. Excludes bolt, breech and breechblock.
Classification: Parts and accessories for military rifles of heading 9301
NSN 5985-00-470-7466
NSN 5915-00-114-0089
NSN 2925-01-523-3607
NSN 5930-01-140-1618
NSN 2925-01-472-4144
NSN 4140-01-050-8096
NSN 6150-01-359-3107
NSN 6620-01-528-7510
NSN 5999-01-099-6172
NSN 5985-00-931-4958
NSN 7035-01-019-5729
NSN 5985-01-571-4173