Unfortunately, the issue of my 14 rd RAMI magazines catching on the bottom of the feed ramp started again. I had previously fixed it with stronger magazine springs.
However, this time I had a new weapon. I bought a PCR last fall and have a supply of the new 15 rd Mecgars! They have a higher lip to prevent the round from sliding forward into the feed ramp before the round is fully elevated.
I found that the front radius of the sleeve needed some light filling to fit on the 15 rd mecgar. There was a slight gap at the bottom that I filled with a .070" o-ring.
My testing has been limited to a few magazines, but successful nonetheless!
I will post pictures shortly.