Thread: BSA Hunter help required.

Originally Posted by Micky Duck

ok...so Im picking the shallow curve the striker? is sitting down on (looking at photo the way it is) is why the bolt "sits" nicely at half cock/bolt nearly all the way up and will stay there but not fire untill bolt handle is lowered,which looking at photo orientated the way it is will put the shiney bit over top of gap ,down the 45 degree bit to the right of the curvy indented bit its sitting in now??????????
always wondered how it did this.

@Micky Duck my understanding of how these half cocks work is as follows:
As the bolt handle is brought down, the nose of the cocking piece moved out of the ‘cocked’ detent, and starts to move forward onto the cocking ramp. At the critical point, the cocking piece comes to rest to the sear, essentially ‘locking’ the cocking piece between the sear and the slope of the cocking ramp. The other part of this relationship, is that the bolt locking lugs need to have just the right amount of engagement with the lug recess faces. I believe part of the reason the BSAs do this so well is the slight relief on the leading edge of the bolt lugs.
It’s a very tricky inter-related clearance based relationship, hence there are only a few people around that can modify a rifle to achieve one of these 1/2 cock positions.