Crap, just saw this. I probably have one I could give 'ya, they all come with a wrench, so I should have at least two. If it doesn't work out, let me know, PM me and I can send you a URX4 wrench.
With the URX4 you do know they get torqued down pretty damn tight right? Tighter than ordinary barrel nuts. Wanna say 120-140ft.lbs. but I'd have to look to be certain. Just bringing it up because if you don't have the wrench I'm assuming you don't have the papers either. Hope you have the proper shims. I have several I didn't use if you find you need some to get it torqued properly.
Really hope you have the papers, because it tells which shim to use based on how it indexes hand tight with no shim. In fact, if you need the papers, I can probably scan mine for you if I can find 'em. Just let me know what you need. Shims, papers, wrench.
I like the URX4 but hate that I have to drill, Dremel out or otherwise modify the key slot next to the gas block in order to drive a pin in it. Even some set screw gas blocks can be a pain in the ass with the URX4, depending. KAC gives a shit because they use a proprietary way of installing their gas block that doesn't require screws or pins (wish their way was more popular actually).
