XM16E1 and M16A1 (Colt Model 603) M16 rifle

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an m16 rifle: note duckbill flash suppressor, triangular grip, forward assist, , lack of brass deflector


the u.s. army xm16e1 same weapon m16 addition of forward assist , corresponding notches in bolt carrier. m16a1 finalized production model in 1967.


to address issues raised xm16e1 s testing cycle, closed, bird-cage flash suppressor replaced xm16e1 s three-pronged flash suppressor caught on twigs , leaves. various other changes made after numerous problems in field. cleaning kits developed , issued while barrels chrome-plated chambers , later lined bores introduced.


with these , other changes, malfunction rate declined , new soldiers unfamiliar problems. rib built side of receiver on xm16e1 prevent accidentally pressing magazine release button while closing ejection port cover. rib later extended on production m16a1s in preventing magazine release inadvertently being pressed. hole in bolt accepts cam pin crimped inward on 1 side, in such way cam pin may not inserted bolt installed backwards, cause failures eject until corrected. m16a1 no longer in service united states, still standard issue in many world armies.







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