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PostPosted: Wed Mar 29, 2017 6:56 am 

Joined: Sat Sep 04, 2004 6:04 pm
Posts: 1553
Location: Massachusetts
The only time it gets tricky is if the vendor (or some subsequent gunsmith) used threadlocking compound on any of the screws. Then things can get interesting...

This is less likely on an air pistol than on a .22, especially on any fasteners that would be removed for normal maintenance like seal replacement.

PostPosted: Wed Apr 12, 2017 6:48 pm 

Joined: Sat Jan 11, 2014 9:08 pm
Posts: 66
10M_Stan wrote:
FWIW, these guys from the UK sell seals for the FAS 609: ... 1796162015

They are listed as Bagnall & Kirkwood Ltd with a1tackleshop as their Ebay store. I've always had good luck buying airgun spares from the UK.

This post indicates that Tim at MAC1 can (has) reseal a FAS AP609: ... &view=next

Of course, this is hearsay and may not be accurate. Here is the contact information for MAC1:

Good luck!


I ordered the seal kit from the vendor above and so far after ruining what was left of my "bolt seal" to get it out I found that at least that one isn't part of that kit. Now the pistol is not just underpowered....
I guess I'm off to the local machine supply house tomorrow!

PostPosted: Thu Apr 13, 2017 7:15 am 

Joined: Thu May 22, 2008 2:21 pm
Posts: 87
Location: Virginia
Here is link to the manual for a FAS 604:

A diagram in that manual appears to have part numbers which coincide with the o-ring part numbers sold by the Bagnall & Kirkwood Ltd a1tackleshop Ebay store. That diagram shows a breach seal instead of a bolt seal (but then, it's for a 604). For reasons that aren't clear to me, European and even German manufacturers will use inch (AS568 standard) o-rings instead of metric (ISO 3601). Perhaps those two specifications overlap? Either way, there's a limited number of choices available so trial-and-error will eventually prevail. Good luck!

Last edited by 10M_Stan on Thu Apr 13, 2017 8:36 am, edited 1 time in total.

PostPosted: Thu Apr 13, 2017 8:09 am 

Joined: Sun Sep 04, 2016 10:59 am
Posts: 550
Location: A new global Great Britain
FAS wont tell me what 604 seal sizes are but I use 2 off each of the British Standard seals below. Being fractional inches they indeed correspond to SAE as well.
BS610 17/64 x 25/64 inch
BS007 5/32 x 9/32
BS115 11/16 x 7/8

Buy 10 of each in NBR70 from a bearing shop on ebay rather than a "set" of seals. Cheap and you know what you are getting.

Plenty of German weaponry in WW1 was inch sized. Like Napoleon never existed.

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