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My newest rifle is a DPMS in .308 and I bought an adapter like what you have there...I ended up putting some loc-tite 222MS on it and inserted a allen(hex) wrench into one of the holes on the knurled part to tighten it. (I didn`t have a little spanner wrench and plier marks would be a sin to me haha). Anyway I have not been back out yet.Main reason I wanted a scope was for load developement anyhow. BTW...I see another rifle in your future...it will have a flat top..oh and a different gas block thats flat also...