Savage Model 1921 12 gauge

I am looking at a Savage Model 1921 12 gauge in a "Riot" config. It definitely didn't come this way. The gun seems very well kept however.

Anyone know anything about these?

Supposed to be a Winchester Model 12 copy. Savage didn't sell a lot. but the two or three posts google fu found says it wasn't because of the quality. Which was great.

Will these run WallMart special cheapie 12 gauge ammo, as well as 12 gauge buckshot?

I am guessing so because these things had to digest those old paper hulled shells. Modern plastic should be a cinch.

Anyway, are these bullet proof guns, or are they finicky drama queens?