Here's a serious thought: Keep the AR in. If it doesn't affect ranges, it can't hurt, right? It wouldn't actually help in this case. I have a theory that the two prong AR has something to do with holding the links of the chain, but I'm far from sure on this one. Too late for me anyway. But the pros of leaving it in would be stopping sand, more cushion for impact, helping against dry fires and misfires, and potentially a more consistent firing, if my theory is true.
Very interesting thought. I am curious to see what others think about this, as I have not been able to decide whether or not I should remove my AR. It sounds like it really does not help much in this case.