take the screw out of the front handle then drill a hole right up through the grip big enough to put a 3/4 inch pvc pipe in and fin out a latch mech and use the front grip as a mag well and simply make spring fed 3/4 inch pvc pipe for the mags and mill out the top to house the rubber ball holding thingy ma doo (dont hate cuz i cant remember what its called)

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ball latch?