Anyone out there using these? These are made for the G21 mags (which just happen to be the same as the G20 mags, or so I thought). In any case, two of these things show up and I promptly disassemble two of my stock G20 mags. I had two identical NOS old school LEO ONLY stamped ones so I decided to use those. As I'm stuffing the new spring up into the new much longer tube assembly, I realize the spring is actually rubbing on the inside of the top part (of the stock tube). I figure it'll break itself in and press on. Well, I proceed to stuff 31 rounds of 10mm in there and am very pleased until I try to unload it. About 20 rounds come out as advertised then stop. There were a few rounds that became jammed in the tube at a slight angle. I fish them all out but the follower appears to be stuck. I disassemble the mag and I had to actually pull pretty hard to free the new spring from the old section of the mag tube. A brief online investigation reveals that there have been a few problems with the new springs rubbing the inside of the older stock mag tubes. OK, I have a brand new, recently manufactured one. I drag it out and same thing all over again and the spring sticks in the new one too; not nearly as bad but still sticks. Question: has anyone A) used them with any success as intended in a G21 (.45 ACP) or B) done what I'm trying to do and/or can tell me why it's not working here. THANKS!