GTA

All Springer/NP/PCP Air Gun Discussion General => PCP/CO2/HPA Air Gun Gates "The Darkside" => Topic started by: HASHTAG on May 17, 2018, 05:38:51 PM

Title: Qb78d breech seal
Post by: HASHTAG on May 17, 2018, 05:38:51 PM

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.

Title: Re: Qb78d breech seal
Post by: Tweeter on May 17, 2018, 07:50:56 PM

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.

Title: Re: Qb78d breech seal
Post by: nervoustrigger on May 17, 2018, 08:14:36 PM

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.

Title: Re: Qb78d breech seal
Post by: HASHTAG on May 17, 2018, 08:24:08 PM

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

Title: Re: Qb78d breech seal
Post by: HASHTAG on May 17, 2018, 08:29:19 PM

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

Title: Re: Qb78d breech seal
Post by: nervoustrigger on May 17, 2018, 09:03:52 PM

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