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The shallow "v" on top supports the open prong flash hider for removal or installation, cut out on left side is for the birdcage flash hider and square hole in center is for
torque wrench and I...

I found an old photo that shows the early flash hiders, as I stated above the second issue M16 tool will not fit the prongs on the early duckbill102626

I know that years ago the M16 tool (this is the second type in my photo) would not fit the duckbill or very first type flash hider. The distance between the prongs is smaller on the duckbill while...