Re: Interesting issue with my KAC URX 3.1 build
Quote:
Originally Posted by
Mrick
I used a 40 year old American made vice my dad bolted to his hand made solid as hell work bench so the vice isn't the problem either. The one tool i didnt purchase was the KAC vice grip tool because $350 was just a bit much for a rail install tool. I still am leaning toward an issue with either the rail itself or the upper being out of spec. I'll see upon disassembly i guess.
The problem is that the PRI clamp isn't really what you should be using. That combined with tolerance differences between the threads are probably going to mean you will continue to have an issue. You can try different uppers and dry / test fit everything before applying loctite until you find a good match OR send the upper to Ayan for install. His services are very reasonably priced. I know that you spent good money on the wrench and want to do it yourself, but you can easily recoup the funds in the secondary market.
IMHO, KAC never should have started selling the wrench. They caved into pressure and started selling it, I understand why. Unfortunately, without a good fixture to secure everything, it's a total crap shoot as to how the rail will align.
Re: Interesting issue with my KAC URX 3.1 build
Quote:
Originally Posted by
eesmith4
Dang. I just sent off the parts for my upper to be assembled by rainier arms with a 3.1 rail, including a krieger SS from compass lake and and a colt upper from SAW
At least they have a good rep, and claimed to have all the parts to properly assemble it. I'll see for sure when it gets back.
I didn't know that Rainier did URX work. Cool.
Re: Interesting issue with my KAC URX 3.1 build
Quote:
Originally Posted by
CharlieMike
Just FYI, I took the upper apart and reassembled it and I can reproduce the problem. I think the OP did a fine job installing the rail -- maybe slightly excessive loctite :^) -- but I don't think the issue was his fault.
The rail is perfectly aligned while it is in my vise but the moment I take it out, it skews about 6/100" measured near the end of the rail.
I think I have a fix for it. We'll see in the morning.
-ayan
Ayan, please update us on your fix. Very interested in seeing what you find out.