By popular request! Four replacement Urethane O rings for the Tube Cap your QB78. Much superior quality to the O rings fitted by the factory.
Fits both long and short Tube Caps. Also fits the Universal Bulk Fill End Cap and the Crosman 160.
Testing at Archer
Airguns shows that most QB78 air rifles in "factory" spec have their
muzzle velocity limited by distortion of the breech/main tube seal
(QB78 Part Number 1500). The original part is too soft and distorts
during assembly. The replacement seals included in this kit are less
soft and increase muzzle velocity by between 20 and 60fps, depending on
the condition of the factory seal. Full instructions for re-sealing
your QB78 family air rifle can be found in the QB78 Family Workshop
Manual, found in the "Manuals" page.