I probably have one of the more upgraded KPs around. I added a regulator, swapped in a high flow Spyder valve, and changed out the springs. All of that got me a somewhat lighter pump stroke, a lower operating pressure, reduced the fart noise, and maybe a little more air efficiency. I replaced the braided hose with macroline, and swapped the ASA for the simple straight-through duckbill from eBay that I like on my pumps. I also found a good deal on a single trigger. The gun shoots great, but in retrospect, I probably should have just put all that money in my "saving for a CCM" fund.
With the barrel kit, you already have what I think of as the only must-have upgrade for that gun. I wouldn't bother with the KP2. If you're committed to open class pump and your KP shoots OK, save up for an Empire Sniper, a CCMed cocker, or a CCM T2 or S6.5.
Old enough to know better. Theoretically, anyway.
Last edited by Mister Crunchy : 07-12-2014 at 08:17 AM.