You don't need aftermarket tubes to use steel in a BSS. I've shot tons of no. 4 steel out of mine with nary a problem. One caveat. . . . if it has a full choke barrel open it to modified. Mine is now choked .018" and .018".

Roughly 15 years of shooting steel no larger than 4s. No issues.


May God bless America and those who defend her.