Mine had a hammer reset issue and I sent it back because I could not find in the manual how to get the trigger / hammer reset. For mine when it comes back I purchased a Primary Arms SLX 1x in green due to astigmatism which makes red dots 'bloom / halo' with my vision. I have a Solofish SL-1131 flashlight / green laser combo for the mLok rails and a Dead Air Key Micro Brake - 1/2x28 - DA109. I will probably add a sling mount to buttstock and maybe some grip tape or nonslip rubber to buttsock when it comes back. I could not find out how to reset hammer in the manual or online so I ended sending it back in probably for 'nothing' but I couldn't fix on my own.
I should have tried this from Kel Tec
Kel-Tec SUB-2000 Hammer Reset - YouTube
FPS_1.jpg - Google Drive
FPC.gif - Google Drive