Bd-38
- Thread starter redleg
- Start date
Sgt Striker
CGN Regular
- Location
- Great White North, Eh!
redleg said:
Thanks for the quick reply.
Coyote Ugly
CGN Ultra frequent flyer
koalorka said:
(From another Forum):
Closed bolt operation for the MP44
The bolt is locked in the breech with a round chambered.
For example, when the trigger is pulled it releases the "hammer" which strikes the "free floating" firing pin and fires the bullet. The bolt then gets blown back by gas and then pushed forward again by the main spring, along its way it will strip another round from the magazine and chambers it.
If the selector is set to semi-auto, the trigger would need to be released and then pressed again to fire another round.
If the selector is set to full-auto then the process would repeat itself until the trigger is released.
The open bolt works differently.
The bolt would be cocked in the rear position and held in place by a sear. The sear is controlled by the trigger. If the trigger is pulled the sear drops and vice-versa. The bolt on an open bolt weapon is milled in such a way that it has a sear catch on it. It also has a fixed firing pin that does not move. Since the firing pin is "fixed" it is sometimes machined right into the face of the bolt and if it wears the entire bolt would need to be replaced. They are not all like that but some are i.e. a STEN bolt and I believe an MP40.
The heavy open bolt design needs to strip a round from the magazine, then chamber the round, and then fire it all in one motion. For this reason an open bolt weapon is not very accurate in the semi-auto mode. The advantage to the open bolt besides simplicity, is the fact that it wont "cook" a round off since there is no round in the chamber when not being fired. A closed bolt system can have a round chambered and if hot enough it could cook a round off.
