Hmmm maybe I should have asked google before I started, I didnt realise it was considered so hard to do!
Anyway after playing with the body I made and a Mauser follower and spring (cause its all I have) and reading Gundocs post the body I made cant work, infact the front of the mag actually needs to be wider than the back to get the rims in the right angle to each other because there is no case taper to help.
The ribs down the Enfield mag are in very deliberate positions.... The front rib holds the cartridge back on by the shoulder.
That Said I dont think it is impossible or even too hard to prevent rim lock, especially with the 410 as opposed to a 12g. The mag will have to have single feed lips as high as possible though, the 410 has no taper or point to help it align with the chamber so it will need to be as close as possible to the correct orientation.
That Patent is kind of interesting and proably similar to what I will end up with, although I would rather have it looking more like the Sten setup. After a bit of looking on the net it also looks like a ZB39 8x56r mag would be pretty close to feeding a 410 as well
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