In complement to the screw, the barrel must be steel compatible.
There is no standard for barrels.
for not charged or little charged polymers.
not suitable with carbide armoured screws.
ABR : abrasion resistant, more than nitrided.
ABR/COR : abrasion + corrosion resistant.
COR : only for corrosion resistance as with fluoropolymers.
800 : the most resistant in abrasion and corrosion.
not suitable with nitrided screws.