With all due respect, Puree is *not* it.
Here is an off the cuff list of barrel verbiage that might help.
Not all stamping is good and many are weak in the ends.

cannon: barrel
surete: safety
purete: purity
guaranti(e): guaranteed
crochet(s): lumps
encastre(s): dovetailed
rectifie(s): ground
acier: steel
brevete: patented
poudre: powder
pyroxylee: smokeless
en long: longitudinal
portee: range
epreuve: proof
normale: standard
renforcee: reinforced
double: double
triple: treble
damas: damascus
fondu: melt

also note that Mens-Mart in the above shotgun refers to the Siemens-Martin steel process.

Best regards,
WC-