Over the past couple of months, as I have an opportunity, I've been stopping at local gunshops to check out whatever .45 LCs they have in stock. I've been able to put my hands on a Ruger, Uberti, Beretta and another that I don't even remember what it was. Shop owners aren't too familiar with mounted shooting. As I understand, there are generally modifications that have to be made when you purchase an off the shelf model. Can anybody tell me what modifications have to be made? Thank You.