I agree with Kutter to a point...I've never been good at tuning a sear, so I can't offer any help there...the most I ever do is stone all surfaces to remore any burrs...also try cycling the trigger with the stock off as sometimes the tail end of the sear lever can drag on the stock during travel...a quick way to tell if the sear levers are touching the stock is, using a small model paint brush, cut off 1/3 of the bristles, and use it to apply a thin, sort of uniform coat of bright red lipstick to the outside surfaces of the rear part of the sear levers...assemble the gun, cycle the trigger, then remove the stock again...any areas that are red need another shave with the palm chisel...re-paint, re-assemble, and repeat...