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Bolt actions and cocking...
Posted by Murphy on Aug 18 2005
Just about all bolt actions nowadays are known as "cock on opening".
What that means is after being fired, the striker is cocked when the bolt is lifted. As opposed to "cock on closing" actions, Mauser model 92,93,94 and P17 Enfield (Eddystone) and others, which cock as the bolt is being rotated down to the closed position.
The Tikka, Sako, M70, M700, M98 and basically any bolt action designed during the 20 century is cock on opening. A cam cut (angled groove) in the bolt body pulls the striker (firing pin) back to a notch (full cock notch) in the back of the bolt body to rest there when the bolt is pulled up and rearward. When the bolt is removed the striker is cocked and at rest on this notch, the firing pin does not protrude from the face of the bolt. If we rotate the cocking piece (that is the generic name of the back end of the bolt), which facilitates this cocking and decocking of the striker, we will get it off the cocked notch and it will fall to the fired position. The firing pin will now protrude from the bolt face. Bolt disassembly, usually takes place from the cocked position but some models require it to be decocked. Bolt disassembly is very rare for American gun owners. I have seen many hundreds of used bolt action rifles, I take the bolt apart on all of them. A learning process for me over the years, certainly, but to make sure everything is as it should be and to clean out that quagmire of yuk (a technical term for a mixture of gun oil, dirt, grass and other vegetation, mud, blood and beer). This is a very neglected space. That hollow body of the bolt will hold a lot of stuff. It is very likely to be the first to cause a rifle to fail to fire, especially in cold climates. Appearently yuk has a freezing point similar to horse manure. (a similar substance)
This information is given for ones own dissemination and not meant to envoke ire or irrational thought. Please use sparingly.
Good shootin'.
Murphy
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