Mags for ruger mark i a100 frame - Ruger Magazine MKI 22LR 9 Round

After reading about the problems some users have had with these magazines, I found that purchasers that have an A54 Frame on their older Mark I's have the problems, but that they work excellently well on newer Mark I's with the A100 frame ( this info is stamped on the frame under the left grip). These mags can be adjusted to fit the older framed guns. I bought three, and I am delighted with them. All worked as I expected them to, and no hiccups such as .22's are supposedly known for.
Rick Gilligan Jr.