USA made 922r compliant:
EXTRA SPRING RETAINER
US Made compliance parts (2) for the HK UMP mags that are economical. This is a set of three parts made by ONe Concepts. The parts are of extremely high quality and durability. Usually there are only two parts but it was very inexpensive to add the spring retainer piece in the set so it is thrown in for free (not an USA compliance part, but is there just in case the spring pops your retainer across the room and is lost).
The mag follower and floor plate are marked USA.
This listing is for one each of the 3 parts.
These items are excellent quality and are NOT homemade or machined. There are no tooling marks. These are injection molded just like the original HK mag.