I got a PA Microdot to mount on a marlin .22 rifle and I had to go buy a 3/8" dovetail to weaver rail adapter. I ended up getting a B square mount from Midway (http://www.midwayusa.com/product/360568/b-square-3-8-aluminum-dovetail-to-weaver-style-adapter-matte). My problem is that I didn't really need both adapters and I basically paid for an extra adapter. The point is that it might be nice if Primary Arms could sell this adapter as individual pieces to people who only needed one. Then again it might be a good idea just to have those adapters available so people have to order from elsewhere.