Thread: M4 receiver or no???
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Old 06-19-2007, 11:37 PM
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Scoots Scoots is offline
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M4 receiver or no???
I'm looking at rebuilding my AR 300 Fireball using Mega Machine Shop (MMS) upper & lower receivers:




What's the difference between an M4 cut upper receiver and a standard cut upper receiver .... and which one is better suited for a 300 Fireball?
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