Vulcan 440 44magnum M1 carbine like.

[browningautorifle]

I did monkey around with converting a 30-caliber to pump. It was a complete failure.

I did one on the other hand that worked flawlessly. I worked from memory of a design I saw when young...some gun magazine layout. Only our inane laws drove it away or I'd still be using it.

Did it ever Extract since your friend has owned it?

That's a really good question. It could be a small thing that would be obvious to us when in hand but we'll never guess it from here.