Re: X mark trigger
With proper work any decent trigger, including the x-mark pro can be made good IMHO. However, if a tuned 40x or X-mark is not part of a custom rifle package, you would do well to chuck the factory trigger and buy a Rifle Basix, Timney etc. Jewel's are amazing, even for the money but best on F-class or bench guns due to tolerances, again IMHO. YMMV.