Feeling the pressure of the left side , i figured i had to get mine done also , but i didnt want to put that plastic piece on so i figured id try to mill in the box in the metal of the gun with my dremmel tool.
first i made a template out of some stainless sheet i had in my garage , to use as a guide to get the edges straight , then i used double sided tape and stuck it to the gun
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Then i first cut the edges with a cuttingwheel on the dremmel , and milled out the rest with a milling bit.
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Result looked like this , then some blueing and weathering , and i must say im pretty happy with the outcome
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Im calling it done for now , might do some more work on the grips though :O)