It helps extend the ACOG further to the rear to help extend your length of pull when using a TA31. On a rifle with an A2 stock, it's a God send. With an adjustable stock, it gives you the ability to run a longer LOP and still have appropriate eye relief.
I used to just pull the BUIS off of my M4 and mount the ACOG as far back as I could. The KRAM will achieve this while allowing you to run a QD mount with BUIS, or extend the ACOG even further back for shooters who need the longer LOP.
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