I took my brand new MKIV down below to my range this morning and nothing but problems. What I did after getting the gun, Took it down and gave it a good cleaning and lightly lubed it with some rem oil. It's what I had. Cleaned the mags in and out as well because they felt a little sticky oddly enough. Cleaned with Hoppe's and everything seemed smooth and in perfect order. Loaded up with what I had for ammo which is Federal Target Grade 325 count white & black box. Not the best but it worked for me in anything else I have had in .22lr and I got a ton of it. This was freshly opened brick. The gun was just terrible, jams, stove pipes, ftf, fte,. I never got through a mag with out constant jams and feeding and ejection problems. I have never seen the likes of it, totally unreliable and unusable. I know some will say well it's shit ammo and maybe so but this was way beyond crappy ammo imo. This gun was just not willing to "run". I went through about 250 rounds nursing this thing, broke it down two or three times ragged down the bolt and it would cycle maybe 6-8 rounds and seemed to be corrected and it would start all over again. I know, try some other ammo and I will. Anyone ever have this experience out of the box new with one of these. It's the mark 4 target model, beautiful looking gun btw but that's about it!