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Like the SP1 These have "slab side" lower, large front pivot pin, full round late SP1 carrier with C marking and exposed firing pin. Unlike the SP1 the MPC marked bolts have a space between the M & P, they also have blue extractor buffer, A2 delta ring, A2 flash hider/peel washer, A2 port door, A2 grip. SPII rifles also have the A2 barrel, handguard, and buttstock (save the Carbines).

1984

301011 SP1 upper, shiney handguards

304436 SP1 upper, shiney handguards

1985-1989

310955 forward assit upper with large A2 plunger and CH forge code, shiney handguards

311XXX forward assist upper with tear drop forward assit

313XXX SP1 upper, shiney handguards

317788 forward assist upper with tear drop forward assit, shiney handguards

3212XX shiney handguards

327XX forward assist upper looks to have the large A2 plunger

339XXX CARBINE, forward assit upper with large A2 plunger CH forge code and shell deflector

339714 forward assit upper with large A2 plunger CH forge code and shell deflector, looks like it has matte guards

3476XX CARBINE, A2 upper with large A2 plunger CM forge code, fiberlite buttstock

354569 forward assit upper with A2 plunger CH forge code and shell deflector, looks like it has matte guards

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