Wednesday, February 16, 2011

The striker works

Not the best video, but for a phone I guess it does okay.

I had a lot of fine tuning to do to get the Holmes striker design to work. I must admit that on my next rifle build I am not using this design. It works, but man is it a pain in the butt to get this thing working 100%. Even now I am not totally happy with it, but it does work.
In case it is not completely evident, there is a notch cut in the rear bolt sleeve that permits a angled section to travel into. This angled piece prevents the firing pin from traveling all the way forward and striking the primer unless the bolt is rotated down, exposing the notch in the bolt sleeve.
Attached to the firing pin assembly is a piece of .5" thick 4140 steel that threads on to the firing pin and the angled piece threads into this piece of 4140. As the bolt is rotated upward and pulled back, the angled piece keeps the striker from rotating. The bolt is then pulled rearward and a new round is inserted, then the bolt is moved forward. As the bolt moves forward, the sear catches the striker and compresses the spring on the firing pin as the bolt is pushed forward and rotated downward. Pulling the trigger moves the sear downward, releasing the striker and allowing to travel all the way forward and hit the cartridge primer, firing the round.

Now that the striker works, the only machining left is the extractor, and my end mills still aren't in yet. I've got some finish work to do around the trigger group housing and then  some Duracoat is in order. Hopefully that will all get worked out next week. For now, the striker works, the trigger pull is decent, and the firing pin dents primers.

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