This was going to be a PM to Seismic Sam, but I figured others might be able to offer advice as well since this issue is probably not necessarily limited to Witness pistols or guns chambered in 10mm.
I bought a Witness 10mm in September and it has given me nothing but problems. I have yet to make it through a whole magazine (not even close) without a type-3 malfunction...fired case in chamber with a new round on top. In addition to the 14lb factory recoil spring, I've tried 18 and 22lb Wolff springs and a variety of ammo. Nothing seems to make a difference.
As suggested at the last North Breakfast, I ruled out magazine problems on a recent range trip by chambering a single round and removing the magazine. I fired the cartridge and the slide returned to battery. Then I locked the slide back and found the spent case in the chamber.
This all seems to point to an extractor problem. I've read reports from other Witness 10mm owners saying the extractor is "too aggressive" and should be filed down to ensure proper extraction. I'm not sure I feel comfortable doing that at this point.
Any suggestions? I'd really like to avoid shipping this off to EAA as their customer service is known to be rather abysmal.