FX FX M4 Micro

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30 cal with 600 mm barrel. Shroud stops at the very end of the long Saber Tactical top rail.

With a 500 mm barrel the DonnyFL KOI will fit inside the top rail and would extend about 1/4" past.

There never was any twist in the M3 spine. The twist was due to the aftermarket extended bottom rails flexing side to side with a bipod attached at the outboard end. The Saber Tactical bottom rail used on the M4 in the video would probably not flex with a bipod that far out.
 
Nice collection, here's some of mine back in 2017

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Oh I should have clarified. The Wildcat is the only one that’s mine. The others are pictures of other builds I collected because I wanted them for reference when I started my planned M3 mini. Ultimately I became intrigued with the idea of seeing if I could give my Wildcat a similar treatment, and switched gears right before tearing into my M3.
Thank you for sharing the pictures of yours. In fact, unless I miss my guess the gold one I posted was one of yours.
 
Oh I should have clarified. The Wildcat is the only one that’s mine. The others are pictures of other builds I collected because I wanted them for reference when I started my planned M3 mini. Ultimately I became intrigued with the idea of seeing if I could give my Wildcat a similar treatment, and switched gears right before tearing into my M3.
Thank you for sharing the pictures of yours. In fact, unless I miss my guess the gold one I posted was one of yours.
Yes, the gold one kinda looks familiar. That was one of a kind that Donny FL wanted me to tune. Here more photo of the gold one.

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