I own an Armscor MAPP1, a compact polymer pistol. Here are my own observations in the pistol. My MAPP1 had been with me for about two years with about 850 rounds shot though the tube. I torture tested this pistol by using it in shooting competitions in the production division. Out of this 850 rounds, I had a total of 3 failures to feed. The first time, I thought a little ramp polishing would do the trick. It functioned flawlessly for the next two or three competitions until it happened again, failure to feed on the second round.
My theory is the pistol's recoil spring is a little undersprung, failing to push the round forcefully into the chamber (Experts please correct my unscientific hypothesis). But then, 3 FTF's in 850 rounds under competition conditions doesnt seem bad.
The double action trigger was extremely heavy when new, but lightened up after use and also by storing the pistol hammer cocked (without ammo of course).
HankC1. The allen wrench size for the rear LPA sight is 1mm. BTW Does anyone know the recoil spring weight for the MAPP1? Also, any recommendations for the recoil spring weight?