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Thread: Rail / Sear slot design

  1. #1
    Join Date
    Mar 2009

    Rail / Sear slot design

    What is the reasoning for the sear slot in the rail being offset (____^____ ) instead of straight down both sides of the sear? Would it hurt anything if it werent offset ?

  2. #2
    Join Date
    Sep 2002
    Live Free or Die
    My belief coming from a design background is it is due to machinine. It is easier & cheaper to walk a larger bit back & forth in that pattern then it would be to use a smaller more fragile bit. It also has the side affect of creating less surface for friction with the sear.

    Does it need to be that way. I would say now.

  3. #3
    Join Date
    Oct 2011
    Sunny, England
    cougar is correct in respect of maching you can use a larger diameter mill bit to creat the narrow slot. also machines faster
    it is possible to use a smaller mill bit and do a straight slot but there would be more friction.

    you only really need it thin where the sear sits on the pin and a point around the middle of sear front to stop it from moving too much.

  4. #4
    Join Date
    Jan 2002
    Halifax, N.S., Canada
    The slot is milled wider than the sear to reduce friction, especially when there is gunk accumulated inside the rail and on the sear. There are two contact points on one side of the rail to the front and back of the pin, and two on the other side of the rail near the front and rear of the sear. These four points of contact help keep the sear from getting twisted and putting extra stress on the axel pin.

    By using a larger mill bit, they can do the slot milling on only one pass.
    Except for the Automag in front, its usually the man behind the equipment that counts.

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