A little secret from the Canadian No.4 manual, the key word below is "MAY".
In the British manuals I have it states to replace the fore stock if the stock has .010 wood crush below the receiver and above the trigger guard. In plane English this is referring to crush wood footprint left at the bottom of the receiver and trigger guard after the stock has been screwed together.
Below, example of wood crush below the receiver and trigger guard or its "footprint" left in the wood.
If you have more than .020 wood crush total you will "NOT" be able to adjust the Mk.1 trigger because the angle of the trigger guard is beyond adjustable limits. This means the sear and cocking piece bent will "NOT" align correctly no matter how hard you try to adjust the lobes on the trigger.
(this is why they went to the Mk.2 trigger hung from the receiver)
Wood crush causes the trigger guard angle to increase the more the fore stock wood is crushed at the forward trigger guard screw.
Now back to the word "MAY" in the Canadian No.4 manual, there are no more replacement Enfield stocks being made. Therefore you "BEND" the trigger guard to correct the trigger guard angle and still keep the old warhorse Enfield rifle in service with your Canadian Rangers. (Or Enfield collectors who want to keep using there old Enfield rifles)
Now bend your trigger guards and change the angle of the cocking piece bent and your stock military trigger will be slicker than snot on a door knob.
Below, cocking piece bent changed to approximately 15 degrees.
Cheers!
The following message was brought to you by an American who reads Canadian manuals.
