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Old January 5, 2019, 07:53 AM   #2
Senior Member
Join Date: February 2, 2010
Posts: 6,679
I assembled an AR 15 upper last night and noted that the dust cover pin would just barely stay in place. I don't know why they don't just put another of those little e-clips on the rear of the pin rather than depend on the barrel nut to retain the pin.
I just measured an AR 15 DC pin @ 3 7/8" and the AR 10 DC pin is at least 4"(can't see the rear as that's a blind hole on my PSA AR 10 upper).
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