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1/25/2018 7:38:29 AM
Posted: 1/16/2002 7:32:34 AM EST
.640 behind the front sight?
Link Posted: 1/16/2002 7:44:33 AM EST
.630" is the nominal diameter under the handguards for the M4 and M16A2, only slightly thicker than the .600" diameter of the M16/M16A1.

-- Chuck
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