Derya TM22 10 round magazine

Update 7 May 2026 revised the followers to fit better and less tendency to roll and catch at the top

Update 22 May 2026 revised the follower printing - print on its back for better results.  Since the TM22 uses the mag follower as the last round hold open, it may wear out the follower over time.  You may need to print some extra followers. 

A simple 10 round TM22 10 round magazine.  This is a modified version of a mag by Anonymous on Odysee for the TM22 Standard model.  I have adapted it to work with the other TM22 models by adding the slots to the back for the mag release button.  I also cut it down to fit in the magwell of the metal/feather/flash etc. and reformed the feed ramp area.  It should still work with the standard model but may look a little weird.

There are two versions.  One is close to the original design and uses a cut down round spring.  The other version uses a more rectangle squared off shaped spring I had on hand.  Both use the same mag body, just different followers and baseplates.

The original maker had words on the back of the mag body that it was not for resale so I kept that on it.

You will need supports for most of the parts.  Print the mag body and base upright.  Print the follower on its back (it should import into your slicer like this).  Six walls/perimeters and 30% infill seems to work fine.  PLA plus or better.  Do not use PETG or it may crack/shatter unexpectantly.

Uses two M3-18 hex head screws and nuts.

Thanks to Anonymous for the original model

Rectangle like version Springs (use as is):
https://hkparts.net/hk-pistol-parts/gsg5-sig-magazine-spring-kimber-1911-22lr-conversions

Round Springs (you will need to cut into two):
https://www.blackdogmachinellc.net/ciener-replacement-recoil-spring.aspx

The round spring is slightly over 9mm in diameter and about 279mm long

Original READ ME from 2024:
Since Armscor doesn't yet sell a replacement magazine that fits the "standard" TM22 here's a printable 10rd magazine for the Derya/Rock Island TM22-A-18. The current magazines they sell don't have the proper notch in the spine and only fits the AR-style TM22 rifles. Uses half of a Black Dog Machine 11" spring. Cut each 11" spring in the middle to make two 10rd magazines. Hardware consists of two(2) M3x18 screws and two(2) M3 nuts. Magazine may hang up the first couple of uses if you have any stringing or uneven Z-seams, but should be 100% by the 5th complete cycle.