M-4 Flat top upper with feed ramps

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This A-3 Flat top is the military standard M-4 Flat Top receiver with the M-4 Feed Ramp cut into the receiver. This upper receiver is only for barrels and barrel extensions with the M-4 feed ramps.

This A-3 Flat top is the military standard M-4 Flat Top receiver with the M-4 Feed Ramp cut into the receiver. This upper receiver is only for barrels and barrel extensions with the M-4 feed ramps.

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