Hot new rail from Trinity.  Get two rails for the price of one!  Top and side rails offer weaver mountings for an unlimited number of sighting combinations.  One of the hottest A5 and 98 rails on the market.  Also works with any marker that has a 7/8" (Weaver or Picatinny) mounting surface such as the X7, BT-4, MR Series and more.  Item may be the RAP4 version.  Both the RAp 4 and Trinity Dual Rails are identical.