plr-16 &-22 problems

anyone shooting these guns find any problem with plr-16 recoil spring and tube fouling so much it fails to push cartridge to full battery after only 50 rds? and my plr-22 just suddenly stopped fireing. it loads fine and hammer falls but no strike on cartridge. firing pin seems to be free and intact.
thx

I've got the 22, at first.after a few hundred rnds the firing pin screws loosened up, loctite did the trick.

besides that I've gone through at least 5000 rnds with zero issues. add the 50rnd mag a red dot and its super accurate at 20 yds.