Colt m4 carbine review - Colt LE6920 Review
Colt 6933 EPR, updated M4 Commando
SP6920
New AR
Swapping out magazines was also easy due to the subtle but effective beveling of the mouth of the magazine well.
Rebuild with the new upper, load it up and enjoy.
And because I spend about 90 percent of my life researching one thing or the other, I decided to go back to the beginning.
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