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Don't know about the time from order to delivery as I bought my CMMG m4 upper NIB private sale(guy had ordered 3 and only built 2 out). I've been running it off and on for a few months now and haven't had any issues. The lines were all smooth, no jagged edges, everything staked properly, etc...
I have it on a stag lower and it's a good snug fit with no extra play or anything.
I have it on a stag lower and it's a good snug fit with no extra play or anything.