Re: x mark pro trigger
You have to adjust all 4 screws, which voids warranty, but it's a POS trigger anyways. If you do it right, you'll get it down to ~3-lbs, but it's not always consistent.
Anyhow, this worked for me but I still replaced it with a Huber and couldn't be happier. With the rifle completely unloaded & barreled action taken out of the stock:
- Start with the bolt open...
- Loosen (1) and (2) a bunch without removing them until the trigger feels really sloppy
- Now slowly re-tighten (1) and (2) while depressing & releasing the trigger gently; goal is for no slop & the trigger springs to reliably reset it back to default position. You'll feel how trigger pull weight increases as these two are tightened. The trigger doesn't have to "spring" back strongly, it just needs to go back on it's own reliably.
- When that's done, close the bolt...
- Slowly loosen (3) and observe thru the small round hold as the sear contact backs off & the firing pin drops on it's own -- this is just past the safety limit and if you open/close the bolt, it will slamfire
- Re-tighten (3) about 1/4 turn
- Tighten the over-travel screw (4) until it just makes contact as you look through the square hole, then barely back it off
If done right, this will set the trigger very close to the minimum safely level. There should be no slop or creep, and trigger break should be very crisp. Tweak the screws a little here and there to get it to feel how you want.
You may have to redo the entire process a few times to learn exactly what you're doing. When you think it's exactly where you want it, do all the safety tests like running the bolt hard to test for slamfires, engage the trigger with partial weight & lift the bolt to make sure it doesn't go off, bounce & bump the rifle with the bolt closed, etc. Then put a drop of loctite or clear nail polish on each screw so they stay put.