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Another thought:
The rifle may be short-stroking. Check and see where your brass is landing with normal fire (rifle not canted). If you are catching brass in the face with the rifle canted, (or, at around the 4:30-6:00 o'clock position when firing the rifle normally), then you are probably short-stroking. If so, you might try running a lighter buffer and/or a reduced-power buffer spring.
Before that you might check the entire gas system for leaks and/or obstructions (gas port, gas block, gas tube, BCG).
Also, just to cover all bases, if the barrel has been drastically cut down (say 16" to 11"), your gas port may need to be opened up a bit as well if it hasn't been already.
Oh, and don't shoot cheap steel-case and/or light-load ammo!
I'm 5'9", and not skinny, so my arms and neck aren't very long. It's a DD offset rail, mounted on the top rail about halfway up the rail towards the FSB, and it's a carbine length.
Also, I don't find the chin weld to be an issue when I have to use it for night vision shooting, so I think a MRD mounted about my acog would work for me. The question at this point is, do I have to trade my micro in for an RMR?![]()
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