Carlsons lube choke tube/ breech plug FEATURES-Choke tube lube-Fluoropolymer penetrating heavy duty grease lubricant-Eases cleaning, reduces wear, & prevents choke tubes from seizing-Fights friction & improves pattern performance Other Features: For use on all choke tubes, also works great on full-auto locking lugs,sears,bolts,and slide/rails,works in temps from -100f - +750f will not attract dust,dirt,or powder fouling,does not contain teflon or ptfe additives