Hatsan AT44, Bullboss air/exhaust valve pin change
Just a quick 'How to* on changing out an air valve pin on a hatsan Bullboss, AT44 etc. The same procedure is almost identical with the BT65 or any of the other Hatsan removeable air cylinder guns. It is not full of fancy editing effects etc, just me doing some stuff which may or may not help out someone else.
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