Im having problems with my used Browning Hi-Power clone (Israeli). Every 5-10 shots, the gun jams. The slide does not advance because the expended cartridge did not eject completely and the next round jams up again the cartridge. This holds the slide open. To clear it, I release the magazine which lets the slide go forward. Insert the magazine and rack the slide. The spent shell ejects and Im good to go for another few rounds until it happens again. I tried a few different brands of ammo; they all did the same thing. The bore and chamber are mirror bright. The spent shell show no deformation and no scratches. The extractor looks normal; no obvious damage or unusual marks. What could be the problem? Where else should I look?