Bar Sto makes only one grade of barrel as far as the rifling goes, afaik, they offer one that will require fitting as it is oversize, the other "Drop In" is
nominally to standard spec. but they do offer different cuts as in
'colt, kimber, etc, and different ramp styles - I'd recommend knowing and
getting a good 1911 gunsmith in your area if you want to get the most
out of a Bar Sto barell even a Drop In. Bar Sto charges $175 for fitting a
barrel but with Bar Sto you know it will be right. If you don't give them a
platform they can work with well that's another issue.
FWIW I have a Bar Sto Drop In barrel in .400 CorBon and it's cut for
a Colt. The gunny I have knows his limitations so when it didn't Drop In to
my S&W 1911 I have decided to just hold onto it and get a COlt 70 Series
and then send it to Bar STo for fitting. LOng Term PRoject Another reason
for a Colt 70 Series is I want a 1911 with the features more like the ones I
carried in the USN externally, well except better sights
and the beat goes on.... yeahda yaddah
Randall