Went through all those iterations. Ran the chopped 4" rail with a long backing plate and 2 screws and with also with just 1 screw. Didn't make a difference. I got the LPSM on the top rail and never looked back.
https://www.m4carbine.net/showpost.p...8&postcount=45
Also been wanting to flush a MOE foregrip in place of the chopped TD stubby.



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