Hi guys... just an update that I had a successful range day on Sunday. 100 rounds down the tube at 50 yards, all hitting within 6 inches, and the majority within 3 inches or less as I got used to the rifle! It is definitely a very accurate little rifle and the recoil is very light. I suspect the recoil buffer is helping. I did experience 3 FTEs out of 100 shots. All three were from the factory supplied 10-round Glock magazine. 2 were from the last round, 1 was from the second last round, which also caused the last round's bullet to get pushed partly into its casing. I shot the "stubbie" anyway

Loading that magazine was also difficult... talk about a stiff spring! I could only get 9 rounds into it. The two KCI mags were faultless! I was shooting Blazer Brass 115 grain FMJ, but I think I will try some AE 147 grain FMJ until she's broken in some more. Thankfully, I didn't experience the dreaded safety gremlin that's plagued some of the newer S2Ks. Cleaning was a snap compared to my other semi-autos, and dirty she was! (thank God for simplicity in design!). All in all, I love this rifle!
My Sightmark QD "Quick Shot" reflex sight ran out of batteries after half-an-hour, and low and behold, takes those hard-to-find AG5 button batteries (think watch batteries)! When it was working, it was aiming 1.5 inches to the right of the bulleye and I ran out of left adjustment clicks.

Not sure how to fix that. Ironically, the "iron" sights were bang on and provided very good visibility. I don't think this rifle really needs any kind of scope for the ranges it is intended to be used, but I went ahead and ordered a 100 pack of those stinking useless button batteries from a Hong Kong based seller. I should get them in 2 weeks, I hope. I will likely use the Sightmark QD reflex sight on another rifle. It does seem robust and well made... with a nice bright sight picturre.
BTW, the gen 2 Kel-Tec quad rail is rock solid and holding firm.