I believe the LRP uses a Target action, which has only a small cutout for the ejection port. The top of the action is solid. If you look at the underside of your rail I bet there is an integral recoil stop that protrudes down slightly. This is designed to stop forward movement of the rail when the gun recoils. This is made to fit standard actions with the cutout that extends over the top. There are some rails that do not have the lug; Nightforce is one. Or you could just carefully grind it off of the one you already have.
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