See our video here for how to replace a breech seal and increase the muzzle velocity of your QB78 family air rifle
Degree of difficulty: *****
NOT fit the Crosman 160
Enough O rings
and gaskets for two complete "re-seals" of your QB78 -
and then some! Also includes replacement barrel and bolt handle set
screws and two extra breech seals.
Now includes square section improved rubber breach seals for easier assembly and improved sealing!