yes its drilled and tapped here is the link to the rail but its out of stock at buds 2nd link is to shop ruger where you can also get the rail 90623 2n link http://shopruger.com/Mark-IV-Mark-III-22_45-Picatinny-Rail/productinfo/90623/

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HI Mark, Yes it is Drilled and Tapped. The Shadow Picatinny rail will save some weight over the standard rail : tandemkross.com/Shadow-Picatinny-Rail-for-Ruger-Mark-Series-and-2245--BLACK_p_128.html

Mark, it is 'Drilled and tapped". The Shadow Picatinny rail will save some weight over the standard rail : tandemkross.com/Shadow-Picatinny-Rail-for-Ruger-Mark-Series-and-2245--BLACK_p_128.html