About 2 weeks ago I bought a brand new KWA 1911 PTP Mk II, and after only running 3 mags through it the slide has started sticking about halfway back. When cycled by hand the slide is extremely stiff and easily jams. When firing there is a noticeable lag when firing where the slide sticks, most of the time the slide will stick in the half fired position until a slap on the slide or a slight shake of the pistol knocks the slide back into firing position.
The more the pistol is tested, the more prevalent the issue. The slide has been oiled till dripping and doesn't affect the performance.
The slide itself has a noticeable grinding feel when racked by hand.
Any ideas? I really would rather avoid dealing with KWA warranty.