Colt UMAREX AR-15 type M4 Carbine M4 A3 .22 lr

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liqrdrms
January 4, 2013, 10:01 PM
does any one know if the Colt UMAREX AR-15 type M4 Carbine M4 A3 .22 lr upper be replaced with a 5.56 upper?
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SilentScream
January 4, 2013, 10:19 PM
No, the fire control system is totally different, as well as the lower being designed to NOT accept a 5.56/.223 upper.
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