does lapping the upper reciever do any good or is it wasted effort? tom/pigpen60
Posted: 8/14/2013 12:39:01 PM EDT
[#1]
Some uppers are machined better then others, I lap all the uppers I install. Oddly the worst one was a BCM upper.
Posted: 8/14/2013 12:56:55 PM EDT
[#2]
have you ever fired a group and then swapped the barrel over to an upper that youve lapped and the fired another group? if so what kinda difference did you see? tom/pigpen60
Posted: 8/14/2013 1:43:56 PM EDT
[#3]
wasted effort
Posted: 8/14/2013 1:44:55 PM EDT
[#4]
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what i think also.
Posted: 8/14/2013 1:48:47 PM EDT
[#5]
No, just part of my build procedure. It was recommended to me by a long time CMP AR builder (I've been shooting CMP since 02), same thing is done to custom bolt action match guns.
Posted: 8/14/2013 1:51:45 PM EDT
[#6]
that just means the long time CMP AR builder wasted effort too, not that it helped
Posted: 8/14/2013 1:57:37 PM EDT
[#7]
I'm not going to argue with a guy that has a high master ranking.
Posted: 8/14/2013 3:58:16 PM EDT
[#8]
I have lapped one upper when I switched barrel nuts and it got the timing perfect. Helped in my situation.
Posted: 8/14/2013 5:31:57 PM EDT
[#9]
I'd say 999 out of 1000 perfectly functioning ARs havent been lapped.
You can do it if you want, but it's a bit of an art and not as easy as it sounds, to do it right anyway (and if you're not going to do it right, why fuccin bother?).
