Anyone thats owns or had owned a razorback .22 upper, have you ever had it run without jamming? I have one that I bought quite a while ago and its has never run more that 5 rounds without jamming or misfeeding. Its on a semi lower. I finally decided to tear into it and try to fix it. There were a number of rough surfaces that things were getting hung up on. I smoothed everything out, lubed everything up. Marginally better. I adjusted the bottom ejection spring open a hair and instantly was able to get it to run where its only jaming about 4 times in a 50 round belt. I have run out of ideas where to go from here and if its even possible to get these things to run without jamming or misfeeding.