I have spent two days now trying to get the trigger pull to a lighter pull and less or no creep on my SPR 18 in 308 Win. By there design I dont think you can get the creep out of them, I did get the pull weight down to a good place 2 1/2 to 3 1/2 lbs.
What I did was remove the barrel and buttstock and then removed the hammer spring, hammer, trigger, and the sear. I found the frame to have a lot of burrs and rough machine marks so I deburred and with a dremel tool polished any areas where it may improve the smoothness of the trigger / hammer assembly.
The hammer has 2 notches on it , the first is sort of a safety position, after you fire the gun the hammer rebounds to this position automaticlly and will also stop the hammer fall if the gun was to be impacted hard enough for the hammer to get past the sear without the trigger being pulled.
The full cock notch is the one I worked on to improve the weight and creep of the trigger. After taking it out and stoneing the notch at least 10 times I was getting no where.
I decided to put the hammer in my mill vice and a small 1/8 shank grinding stone in the chuck and take alot more metal off and see where it went from there. I did this several times before I noticed any improvement, then I finally had the pull weight down but still alot of creep.
I then took the sear and with a hard felt wheel and polish, polished it to a shiney surface and reassembled the action, still creepy, so I did alittle more smoothing on the hammer notch and left it at that point.
The sear in this gun is mounted on a pin thru the trigger and held under tension by a leaf spring, so by design I see to much movement required to fire this thing to ever get all the creep out of it. If this just had a hammer with a notch and the trigger itself engaged into that notch you would only have the small amount of movement required to disengage the hammer from the trigger to fire but on this Russian gun they put in another pivot poit and slack to take up before that can happen, but I will say that the safety factor that there design provides is a good thing.
But after punching the 2 pins out 30 to 40 times while working on this , I am done with it. It will just have to be creepy and live with it, now to develope a load this thing likes... hope this is eaiser than the trigger !!
Jed