So we all agree that the 12 lb pull on the UL50 is a little tough. With unmodified trigger parts I think the best I shot was a 3 MOA group. Yuck.
I realized that the overtravel on the trigger could use some work. The hammer spring is wound so tight that once it breaks the overtravel in the trigger was causing me to shoot left every time.
Here's what I did.
1) I cut one leg off the hammer spring. I've done this to alot of stock AR-15's with great results. Then, using a Chevy small block exhaust valve, I slipped the loop of spring with the long leg around the end of the valve and wound the spring a little tighter. This effectivly reduces some of the pressure on the hammer when the spring is wound up.
2) I drilled a #21 hole thru my selector switch and tapped it with a 10-32 tap. When the selector is in the fire position, the hole goes straight down to the trigger underneath. I then threaded a 10-32 machine screw into the selector body which goes all the way thru and acts as an overtravel stop. I kept inching the screw in until I got all the overtravel out, but not so tight that it would jam the trigger against the bottom of the hammer. I then stacked the appropriate amount of washers under the screw to get the proper clearance and used some green threadlock to keep it there.
3) I borrowed some honing stones from my neighbor (who just got back from gunsmithing school). I made just enuf passes on the trigger and the hammer to clean things up. I learned my lesson with my Browning Hi-Power that a bunch of very light passes is better than a few heavy passes with the stone (buuuuuurrrrrp...oh sh!t).
I'll get some pics, and a trigger pull scale. This prolly seems a little vague but I thought it might inspire some others.
Also, does anyone here shoot Talon reman ammo? How does it shoot for you?