Here's a few more pictures.
Installing the gas tube in the gas block. A portable vise on a 2x6 C clamped to a near dead desk chair that just happens to be pretty damned solid.
Using the widget tool that allows the gas block to be tightened to the tool where it can be held in the vise at multiple angles to drive the roll pin.
I used a roll pin holder to start the pin, followed by a flat punch, followed by a roll pin punch to center the pin.
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The witness window on the bottom of the enhanced upper receiver. You can see the Geissele reaction rod on the LHS The window allows you to see the flange on the barrel and verify it butts up against a ledge inside the receiver. A flashlight is VERY helpful on this!
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The completed uppers side by side. 243 Winchester on top. .308 Winchester below.
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The Carbine lower with the 243 upper. Temporary placeholder mil-spec stock.
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Muzzle device and barrel marking on the .243.
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