Welcome to GBO. You can use any shotgun (SB1) frame, but stick with the lower power loads. I'd suggest a rifle frame (SB2) that way your not limited. NO frame is a guaranteed fit, it's all in the FAQ's. Frames and barrels pop up for sale in the H&R Classifieds all the time or you can make a want to buy ad in Want to buy H&R. FAQ's are at the top of the H&R centerfire forum.