AR-15 buffer length?

Discussion in 'Rifle Discussion' started by Keane, May 14, 2009.

  1. Keane

    Gaston, OR
    Active Member

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    Hi all-
    I am in the process of building my first AR. I started with the Cav-Arms Mk-2 lower.

    I just got an upper in (a cheap gunbroker 16" upper, no idea of the brand), which came with a bolt and charging handle.

    However, When I assemble it, the bolt doesn't go back all the way! It only moves about 3 inches or so, not enough to even clear the chamber.

    When I pulled the upper and lower apart, I found that the buffer doesn't seem to go deep enough into the stock. What length is this buffer supposed to be? The one I have, is nearly 6" long, and even without the spring, doesn't seem to go back all the way.

    I got the buffer from the previous owner of the lower, but I don't know if you can buy these in different lengths.

    Am I doing something wrong?

    Edit: After doing some additional research, it turns out the person I bought the lower from, included the wrong buffer/spring. Thanks for your time...
    Last edited: May 14, 2009
  2. NoAim

    Hillsboro, OR
    Active Member

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    That's correct. Even though it's an A1 length stock, it uses a carbine buffer.

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