Breech dimensions
I can only find a drawing in this thread http://talonairgun.com/forum/viewtopic.php?t=4
It does not give any measurements to the breech. What I need are the oring groove dimensions, anybody got the #’s?
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On the bolt I made I just went with the loose end of the dimensions listed in the machinery’s handbook to allow for easy sliding over the barrel. I used oversize rings though so my numbers will be different, looks to be consistent with this chart though. You need to size your clearances for the durometer o-ring you plan on running to avoid extrusion.
http://www.allorings.com/gland_dynamic_reciprocating.htm
http://www.allorings.com/pressure_vs_clearance_gap.htm