I just bought a UCII in 9mm and fired it for the first time yesterday. I experienced a high number of malfunctions; stovepiping, FTE, and failures to return to battery. I fired maybe 100 rounds in total, varying the number of rounds in the mags between five and eight.
The ammo I used was Armscorp 115 GR FMJ and Magtech 147 GR FMJ. I did not notice a discernible difference in the malfunctioning of either. I have two Kimber mags, both returned the same results. The weapon was cleaned and lubed per the manual before the range. I held the weapon firmly as I do with all my handguns, no limp wristing.
Neither the manual or the website offers any info on recommended 9mm ammo except for "high quality American made" with "230 grain" bullets, which does not apply here. It seems they neglected the 9mm.
Any advice/help much appreciated.