Would like to use a sling with the QD attachment. I don't seem to be able to Google any Arca "plates" that have a flush cup for the sling. Stock has flush cups on the side, but too far forward. Do the removable Arca plates mar the rail when you tighten the thumbscrew? Seems crazy to bolt a piece of Piccatiny rail , with the flush cup on it, to the sliding Arca plate, to get bipod and sling attachment points. Am I missing something here? My other stocks have sling studs for Harris bipods, or Pic. rail for QD bipods.