A speed loader for WE Glocks that keeps the magazine spring down while you load BBs into the magazine. I've only tested it on a WE Glock 23, but it can probably work on other brands of airsoft Glocks, as they're pretty much copies of one another. There are other versions of this online, but this one comes with a funnel that makes it usable without a syringe style speed loader i.e. you can just dump loose BBs into the built-in funnel. 

Usage

• Pull down on the magazine spring fingernail tab a little bit.
• Insert the magazine to the speed loader from the bottom, making sure that the bump on the speed loader presses down on the magazine spring fingernail tab.
• Once inserted, push down on the speed loader until the magazine spring bottoms out.
• Load BBs into the funnel either using a syringe style speed loader or from a small bottle (as pictured).
• Give it a shake every few rounds to ensure perfect double stacking of BBs.

Details

• Prints without supports
• Solidworks Part file included, feel free to edit and make remixes