It's done by re-shaping the hammer hooks (if this rifle has them? I'm used to 1911's myself) and the sear with grinding and polishing stones and/or special files. Experts can do them by eye, and there are also jigs out there to help. Bottom line is look for an after-market trigger assembly or go to a gunsmith. This is not something to do your self without a lot of instruction. Trust me, it's really easy to screw it up and get an un-predictable trigger. You'd be amazed how little metal has to be removed. Btw, this also removes the hardened metal that was created by the manufacturer as a wear surface, and your trigger will "wear out" quickly and need further adjustment.
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