I first came to this project out of need since I use my Disco as a pest removal tool and have taken many many, tree rats, skunks, coons, possum, woodchuck, etc and the need for a follow up shot was ever present.
Hand loading pellets in the bolt action .22 cal was too slow and cumbersome and took my eyes off the target pest for far too long just to get a follow up shot.
I needed a faster way to load a follow up pellet that could be done with as little time taking my eyes off the wounded pest flailing around or attempting to escape so I experiments with a detachable magazine project. This was never meant to be a plinking or target tool since there is no need for speed for the next shot and loading a pellet to shoot paper means you can take your time and take your eyes off the paper target to focus your attention on loading a pellet. This was meant to be a hunting tool to get that 2nd pellet loaded as fast as possible to dispatch the critter.
Early designs were for up to 10 pellets but I abandoned that for a few reasons.
1. The detachable magazine stuck out (protruded) too far out the side of the airgun while walking around the woods and when laying the airgun on its side, the options are on the bolt or on the detachable magazine. Laying the airgun on a 10 pellet magazine was a bad idea.
2. Stacking that many pellets on top of one another in a gravity feed situation while walking and stalking was having negative impacts on the soft lead skirts of the pellets so I settled on a 6 pellet magazine as the balance between getting that follow up shot ( or 2) and a compact design that fits under even the lowest of scope rings seemed to work best.
I designed it to work with domed or wad cutter pellet heads in the diablo skirt shape since that is what I use. I designed the detachable magazine so that it could be made on a 3D printer with as little post processing as possible and because the plastic is non-maring to the bluing of the airgun metal. It attaches with a single screw and embedded nut. I'm currently calling it the "DROP 6" since its a gravity feed, 6 pellet magazine that works very well and has helped me send many critters to their reward.
Here is the latest update on my project.