UPDATE 2026:  this is really trash compared to Leedle's actual real one, go print that instead :) This is left up for reasons of some kind I guess

This is LeedleDynamics' Stringer Mega Masterkey, upscaled to fire Mega XL darts.  The only part that is really different is the slide; all of the other parts simply are scaled up.

UPDATE 2025-06-11:  While this model is definitely still viable, I made a new version that I think will be significantly better.  You can find that here:  [https://www.printables.com/model/1266725-mega-xl-stringer-masterkey-heavy-remix](https://www.printables.com/model/1266725-mega-xl-stringer-masterkey-heavy-remix) 

UPDATE 2025-04-09:  I reworked this some (shortening it) and printed a test.  It works!

However, the other one I had linked may be still better proportioned:    [https://makerworld.com/en/models/935522#profileId-900288](https://makerworld.com/en/models/935522#profileId-900288)

Both are viable.