Archer Airguns 2X Seal Kit for QB78

• 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.

The O rings are premium 70 durometer hardness, those for the Valve and Tube Cap are made of EPDM, the remaining O rings are Buna meterial. These are not original QB78 equipment but are superior-quality replacement parts.

A complete re-seal of the QB78 requires the gun to be completely dismantled and re-assembled, so do not even think of ordering unless you understand what you are getting in to! The only seal not included in the exhaust valve seal which is integral to the Valve Stem Assembly (Part Number 0408) and is included in the Archer Airguns QB78 Valve Kit. Specially packaged by Archer Airguns, this kit contains the following parts: