The Delta HBAR, R6600DH was introduced in 1987.Ģ15677 appeared in the May 1986 issue of American RiflemanĢ49256 this is a Delta H-BAR, as in R6600DH, white label box
Not going to list features of each example, unless they are different then indicated above. Features are as such:ĬM upper forge code, big hole slab side lower, no sear block, no auto sear cut in upper, small pin hammer/trigger pins, modern small forward assist, SP1 bolt carrier, bolt marked MPC with a space between the M and the P, blue extractor buffer, AR-15 A2 HBAR SPORTER, lower roll marked COLT’S FIREARM DIVISION, barrel stamped C MP 5.56 NATO 1/7 HBAR, peel washer, A2 furniture, bayo lug Serial numbers picks up were the SP1 left off, produced 1985-1990. So yours should have these bigger trigger/hammer pins unless yours was an older COLT FIREARM DIVISION lower? Trigger pins were switched to the bigger size starting with MH 006600. You fits into the later MH029XXX features rather then the earlier type.
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