
Originally Posted by
ScottsBad
Hi, I'm not trying to hijack this thread, but I saw lapping mentioned as a possible solution to barrel nut alignment issues. I've been looking at a lapping tool on Brownell's because I'm not happy with the torque range I'm getting with a NSR barrel nut. Either way I turn the nut the range is either too high or too low (Noveske barrel and upper).
Would it make sense to lap the upper slightly to adjust the torque? From what I read above this sounds like a viable option. I've never liked the idea of a shim of any kind.
Also, do you know of a place where I can read about the proper procedure for lapping the receiver, since I've never attempted to do this before? Any help would be appreciated thank you.
That was a great post by Surf. I just assembled my new patrol upper using that exact lapping jig from Brownells. It comes with excellent written instructions...just make sure to use a thin film of grease on the main shaft of the jig that rides in the upper. I used some Aeroshell #7 with a Slip 2000 EWL floater to get it to turn freely and without chatter inside my BCM upper. Some jeweler's rouge or other lapping compound (preferably a non-embedding compound unless you really enjoy detail cleaning) goes on the portion that sits against the receiver face. Just spin slowly and with even pressure until about 80% of the anodizing on the receiver face is removed.
I was easily able to make my torque window when installing using a GI barrel nut and I only needed 4 windage clicks on my MBUS gen-2 rear sight to get the 18" RA Mountain Series barrel zeroed and verified at range (50m/200m zero). I've never had to use so little windage on a rear sight before. The front sight only needed 2 full turns from how it came from Magpul. Very easy.
"That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892
"The body cannot go where the mind has not already been."
Bookmarks