Aside from the Briggs and Stratten muffler look are there any down sides to a shotgun outfitted with one of these things.
The LGS has a Beautiful Winchester pump outfitted with one of these things. It is an upland length barrel, vent ribbed, with nicely figured wood <$300. The blueing is still pretty nice (light carry wear), no rust, 12Ga 2 3/4 chamber. Something about it just looks like it was a high zoot gun in its day. Don't know why, it just spoke to me.