I do and for another Avenger in .25 cal. and again in .25 in my Dreamline. I also have dealt with the OEM magazines in Avengers and other rifles. I also have a large capacity A.E. Swede. It is a well made mag. and utilizes good quality materials it is #1, Still a bit better made take off on a old and designed flawed magazine with the same weaknesses and shortcomings. Hard on probe seals, miss alignment of pellets when seating, lack of alignment support for pellets and slugs when seating, same PIA rotating top cover and plug one hole while shoving a backwards pellet in the other side of the magazine. Oh and cheap springs and diddling around with tiny cover screws. Price is cheap but in the case of the OEM Magazines, you get what you pay for.
The CARM Magazines are very well designed, Much more rugged and easier to load and use. The CARM Single Shot Loaders with the swing out cylinder are an improvement over fumbling around under a scope and mounts as well. I prefer using their Mags in the FX as well. Again easier to use, dead reliable and Much less expensive.
P.S. I want to clarify myself a bit. When I referred to cheap springs I was speaking strictly about the standard OEM, manufacturer supplied magazines for the Avenger, Aspen, M,rod, and Liberty. I am Not saying the springs in A.E. Swede mags are poor quality and all my past experience with them has shown me they are not.