CMMG AR-15 22LR Single Stack Magazine

Here's my take on printable AR-15 22LR magazines for CMMG conversion kit and similar. The project started way back in 2018 and has been put on hold during the pandemic. It works for me, but no testing was made by other people (yet, hopefully). As I was too late to make the first 22LR mag, I've added some features that other lack, mostly focusing on the beefiest possible feed lips that can be easily replaced.

Features

• Only 1 screw required for assembly
• Easily replaceable feed lips, updated version with steel wire reinforcement is available
• Prints without supports (Skeletonized version only, Flat requires some)
• Flared top for faster reload
• Floorplate removable with spent casing
• Comes in two sizes of 15 and 25 rounds capacity
• Two different styles: 
  — Skeletonized, printed vertical, quick to print and lightweight, good grip
  — Flat, prints horizontally, high strength, good for windows, MMU ornaments, or stippling.

Feed lips should fit snugly in their spot and are secured with a single m3 screw with maximum length of 20 mm. Do not overtighten, as the screw threads into plastic only. 

Flat magazines require assembly by sliding both parts together and securing them with short filament pieces in the back. Overinsertion stop should be then lifted by a pointy object and filament piece be slid from the back to block it in extended position.

Larger magazine uses 0,6×9×190 mm spring, smaller 0,6×9×130 mm. You can use magazine replacement springs, but normal springs can be bought for cheap on AliExpress and cut to the correct length.

It's best to print the follower in bright color for better visibility and with different layer height than the magazine body for smoother operation.

Fusion files have parameters defining tolerances, these can be used to fine-tune fitment to your printer.

Check out my other things for 22LR and happy printing!