There’s nothing like a little controversy to stir things up – reading here about opinions on Winchester’s vaunted Model 21 side by side – along with opinions about a possible up-and-comer in the used gun realm – Browning’s BSS (acronym for Browning Side by Side). The Winchester Model 21 has a long standing favorable reputation among many shotgunners, but especially among those who favor Winchesters of all types, maybe even more especially among Winchester collectors.