Took a previously unfired (by me) 1917 BSA No.1 Mk3* to the range today.
It has been re-parkerized and also has a Canadianicon Arsenals C / arrow stamp. I am not sure if those two are related. Bolt is pretty stiff to close.

The first stage of the trigger seems fine - trigger moves back about an 8th of an inch after the first resistance is felt and the cocking piece minimally moves. THEN it becomes a battle to pull the trigger. To fire the pull is the toughest I've ever had to deal with, The trigger moves a full 1/4 of an inch and the cocking piece moves back a 1/16" or so before the break.

I'll need to do something to fix it - just wondering where to start to work through it logically.
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