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NJP barrel kit w/o-rings 25mL
A 25 mL replacement cylinder complete with O-rings, the usual repair when a smaller repeater starts leaking or drifting off dose.
Details
Most repeaters that come across a counter as broken need one thing: a fresh cylinder and fresh seals. Grit that got past a rinse scores the bore, the O-rings then wear unevenly against it, and the gun starts losing product past the piston while delivering slightly less than the adjuster says it should. The kit is the standard 25 mL cylinder assembly with its O-rings, which is the pairing that actually solves the problem rather than deferring it. It suits the 25 mL semi-automatic repeaters, as the plastic pistol grip and the metal Ezi-Grip both take the same barrel at this capacity. Swapping it takes a few minutes. Unscrew the cylinder, replace the O-rings on the piston with a little applicator lubricant on them, and thread the new cylinder home. Lubricate before assembly rather than after, so the first stroke is not the one that damages a new seal. Two points of caution. This is a rebuild part and should not become a regular line item, and if it is, the cleaning routine is the thing to change. And it is 25 mL only, so read the capacity off the gun rather than guessing, because the 50 mL kit will not fit. Guns running oil-based products want the oil-base barrel version instead.