Dan, if you're talking about this one budsgunshop.com/product_info.php/products_id/713092984/iver+johnson+pump+12ga+3 ....it is not drilled & tapped, but it does have a dovetail rail. Have a great day!

I would contact Iver johnson with the model to be sure iverjohnsonarms.com/contact.html

Dan, I do not see whether or not in any listing. For an accurate answer, I would ask Iver Johnson Customer Service directly at 321-636-3377​ Monday-Friday 1000 - 1600 EST or by online inquiry here : https://iverjohnsonarms.com/contact.html

Buds has many Iver Johnson shotguns fitting that description. If you could give a model number or upc code we can give a definite answer. Or go to the products page, click on questions and answers, then ask the community and that will show us Wich one you're looking at. Hope this helps.