Qb78d breech seal

[HASHTAG]

I keep trying things to make my breech seal work correctly. I am losing alot of co2 from faulty applications that I keep trying...

Can any one point me to a legit breech seal ring or a self made one from materials locally.

[Tweeter]

You mean the transfer port seal?  If you do I use a crosman 2240 transfer port seal in my Qb-78 and it fits, seals and works perfectly.

[nervoustrigger]

Agreed on the Crosman part.  Or you can get some poly tubing commonly used for built in ice makers in a refrigerator.  It’s 0.25” OD and 0.170” ID.  Cut a piece 0.100” long.

[HASHTAG]

Yea the ice tube maker is last resort if the cross man version doesn't work out. Thanks guys.

[HASHTAG]

Do you use the metal insert also. Or just the gasket part

[nervoustrigger]

Just the gasket.  It is essentially a square cross section O-ring.