AR15 (20) round magazine

thingiverse

Remix from this talented dude: https://grabcad.com/library/ar15-10-15-20-and-30-round-223-5-56-magazine-stl-s. Keep in mind, this design is yet to be tested at the range and I'm eager to see how it performs. Lots of snow here, so it might be a while before I can give it a thorough workout. The rifle cycles fine, but I need to put it through its paces to ensure it holds up under heavy use. You'll need to choose a high tensile strength filament like HTPLA or Nylon if you want to get a reliable print. ABS may not be the best choice for this project, so I'm not sure if it will even work. You can also cast this design in rigid resin or aluminum for added durability. Disclaimer: If you make a critical mistake and damage your firearm or yourself, I'll take no responsibility. The decision is yours, and you'll have to live with the consequences. Update: I've rescaled the design from standard to metric units, which should please Cura even more. Update (1/18/2019): I added 0.65 mm to the longer side walls, but the follower and floor plate adapter still need an update to match. You'll have to sand and polish them in to avoid any binding issues, so be sure to print with plenty of walls for a smooth finish. Update (1/22/2019): I wasn't happy with how much the feed lips flexed even with premium HTPLA, so I decided to anneal it. My brand of filament shrinks about 1% on both axes, so make sure to account for that in your slicer if you plan to anneal (I highly recommend it for more than three rounds). The strength has increased and I'm much happier with the feed lips now.