I had my doubts about this grease gun given its low price. But I thought it would be worth taking a chance on it. The construction of the gun and its accessories is much better and heavier duty than I thought it would be. The locking coupler works perfectly, and the pinpoint nozzle will be great for lubrication my sprocket-nose chainsaw bars. My only concern is the plunger seal. It does not seem to be very strong or well crafted. That said, the gun performed extremely well for my low pressure applications (i.e. lawn tractor wheel bearings and kingpins). You cannot go wrong with this grease gun!