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M1a1 Thompson pistol grip difference


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Hello all,

Random question, what's the difference between the slotted and non slotted grips? Was it a Manufacture or time frame thing? Or both? Ive been trying to research it, but haven't determined anything. Thanks in advance 

 

The left is unmarked and doesnt have a slit, the right is marked with a slit. 

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The one with a slot was originally for a 1928 Model, modified with the "step" at the back to fit the M1 and M1A1 models. The grips originally made for an M1-M1A1 do not have a slot. The modified grips are somewhat common.

 

 

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Somewhere I picked up the idea that slab sided grips were always reproductions or grips from later semi-auto guns. True?

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