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38 Posts
Is it possible to convert the original usc lower to fit ump mags?
...OR, you could fab up some plastic or metal rails on the sides of the front and rear piece of the lower receiver after the middle has been cut out, and use some form of riveting or screws to hold it in place.
I am willing to try this on one of my spare lowers, but I have to find a highcap 25rnd mag cheap before I try it on a whim.