The CARM magazines are very well made.
Each of my guns has a par (or more), and the only problem experienced is a broken O ring on one of them
With an email to Darko I learned the proper size, and replacement was easy.
FWIW
In 25 caliber the original equipment Marauder & Aspen magazines are different from each other, and not interchangeable.
Unlike those made in 22.cal.
If recollection serves well, CARM does not list a 25 cal for the Aspen for that reason
Hope this helps
Ed