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Thread: Name & Use Of This Part Of Bolt?

  1. #11
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    Quote Originally Posted by mtdawg169 View Post
    Which ones & why? To the untrained eye (meaning yours truly), they all look the same except for the one where the lug cuts extend back into the ring around the bolt body. I know zip about colt parts, so I'm curious what makes them different.
    They all appear to be stamped "MPC".
    Doesn't that make them Colt?

  2. #12
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    OK, here is a pic of a proported FN bolt with the semi-elliptical depressions behind the lugs. I care not the authenticity of the bolts' manufacture but I am curious to learn the name and function of these bolt characteristics.
    (Mod: If pic is not in public domain, please delete it.)
    Last edited by catargadelendaest; 08-29-10 at 13:51. Reason: resizing

  3. #13
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    Quote Originally Posted by polymorpheous View Post
    They all appear to be stamped "MPC".
    Doesn't that make them Colt?
    No. The canted lettering is a giveaway.

  4. #14
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    I have seen Colt bolts with other types of MP markings. I believe some were MPJ and MPY. I would say that some of those are possibly FN and maybe LMT.



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  5. #15
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    Quote Originally Posted by Iraqgunz View Post
    I have seen Colt bolts with other types of MP markings. I believe some were MPJ and MPY. I would say that some of those are possibly FN and maybe LMT.
    does LMT produce bolts without the lug undercut?

  6. #16
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    I thought some of their older stuff was, but I am not 100% sure.

    Quote Originally Posted by bkb0000 View Post
    does LMT produce bolts without the lug undercut?



    Owner/Instructor at Semper Paratus Arms

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  7. #17
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    Here's my FN bolts, marked MPF - I believe they are legit.
    They have the same semi-elliptical cuts.

    Feel free to save this image and use it whenever you like. It's the best I could do with a cell phone (I spend my money on guns, not cameras )


  8. #18
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    Here's a shot of the F marked extractors:

  9. #19
    Dano5326 Guest
    Colt bolts marked MP_ or MP__ up to four place stamps.

    FN bolts have been MPF with an underscore under one of the letters, usually the F

  10. #20
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    I have no clue as to the name of the area in question. As far as purpose I would guess that area was trim down to allow more free movement of the bolt inside the carrier causing less jams due to excessive carbon build up.

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