I just ordered the sling, stock extension, forend rail, & scope mount for my SUB-2000 directly from Kel-Tec a few days ago. I'm not sure how much I will use some of this, but I thought I'd order it all while I was ordering (I was ordering some extra mags, a belt clip, & a lanyard for my new P3AT anyway). I've had a SUB-9 for quite a while now & the only thing I ever mounted on it was a short rail (that I had to improvise) for a Streamlight M3. My wife has taken over the SUB-9, so I thought I'd try some different things on the SUB-2000. I don't see using the sling much, but who knows? I do plan to mount a small red-dot sight & see how I like that, and the forend rail should be just right for an M3.
Anyone here have experience (good or bad) with the factory scope-mount?