As Mag410 states, the factory .410 and 28 gauge guns were always built on the small frame. When I started competing in the 70’s there were still a few Purbaugh and Simmons conversions around, but most were shooting the small frame 1100’s and a few still shooting 870’s. I still have a matched set of 870’s. Bought my first small frame 20 ga. in 1975.
