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Thread: Bushmaster Acceptance Inspection (8/07)

  1. #11
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    Quote Originally Posted by jmart View Post
    Good writeup and good pics. While it's not terribly comforting seeing the flaws in the product, luckily they are easily correctable.
    Thanks.

    These flaws would be easy to correct on assembly, which is most befuddling. This is deliberate indifference, or gross incompetence.
    2012 National Zumba Endurance Champion
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  2. #12
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    Quote Originally Posted by shooter521 View Post
    Why replace the bolt? Other than having the incorrect extractor spring and insert, what's wrong with it?
    Quote Originally Posted by Pat Rogers
    My assumption is because it is not MPI
    Quite right, Pat. Just in case.
    2012 National Zumba Endurance Champion
    الدهون القاع الفتيات لك جعل العالم هزاز جولة الذهاب

  3. #13
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    Quote Originally Posted by dangertree View Post
    Do I see CM on that bolt? If so, CMT bolt, likely is MPI.
    Sorry the pics are bad this time. The bolt marking is "CM." I'm not sure what that marking denotes. Is it in fact a CMT bolt?
    2012 National Zumba Endurance Champion
    الدهون القاع الفتيات لك جعل العالم هزاز جولة الذهاب

  4. #14
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    Stag bolts have CM stamped into them. I wonder if BM cannot produce enough bolts and are having to buy them from other sources?


    C4

  5. #15
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    Quote Originally Posted by C4IGrant View Post
    Stag bolts have CM stamped into them. I wonder if BM cannot produce enough bolts and are having to buy them from other sources?
    C4
    Seems like it in this case. I know Continental Machine began stamping their bolts with CM stamp this year. I thought I noticed it in the pics. For whatever reason, it seems BM sourced this bolt from CMT. It's my understanding that CMT MPIs their bolts, I don't know what BM requests or pays for when they outsource, or if this one is MPI. BM would know though?

    Good bolt anyway. A reliability kit and off to the races.

    Regards,
    Walt

  6. #16
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    Quote Originally Posted by dangertree View Post
    Seems like it in this case. I know Continental Machine began stamping their bolts with CM stamp this year. I thought I noticed it in the pics. For whatever reason, it seems BM sourced this bolt from CMT. It's my understanding that CMT MPIs their bolts, I don't know what BM requests or pays for when they outsource, or if this one is MPI. BM would know though?

    Good bolt anyway. A reliability kit and off to the races.

    Regards,
    Walt
    SA does MP test each bolt. The question is if BM ordered them that way. One of the things that freaks me out about these large manufacturers is that they will buy just about anything in order to push guns out the door. So some months they use CMT bolts. The next month they get them from Lord knows where.



    C4

  7. #17
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    Quote Originally Posted by Skintop911 View Post
    Thanks.

    These flaws would be easy to correct on assembly, which is most befuddling. This is deliberate indifference, or gross incompetence.
    I suspect indifferenbce. After absorbing all the anecdotes of BM flaws it appears to me BM doesn't feel these steps are required. They're obviously putting zero effort into these areas, it's as if managment is directing the line assemblers to assemble them in the manner that we see on our end. I don't beleive these are errors or oversights, it's simply disregard.

    I sent my carrier off to Grant months ago to properly stake, done.

    I added the HD extractor spring and black insert, done.

    I run an A2 stock so castle nut staking is N/A.

    My FSB is installed properly, no problem zeroing for windage with either the original RCH or a LaRue BUIS. When I switched to the LaRue, I did have to purchase the .040" taller front site post to get it to zero for elevation without having the post backed almost completely out.

    No problems to date with any BCG or FCG parts. I don't know if they are cast, forged, whatever, but they've worked fine.

    I'm guessing 2,000 - 2,500 total rounds fired.

    I haven't made any attempt to verify my chmaber dimensions, but I had no problems going through my initial case of XM193 and some small quatities of Win WB. All other loads have been reloads loaded to no greater than published maximums for .223 data, most of it though is backed off anywhere from half a grain to a full grain. No problems with popping primers or case separations or any other typical ammo anomallies.

    I'm OK with my BM, but my next build will be from a different mfg.

  8. #18
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    Quote Originally Posted by C4IGrant View Post
    SA does MP test each bolt. The question is if BM ordered them that way. One of the things that freaks me out about these large manufacturers is that they will buy just about anything in order to push guns out the door. So some months they use CMT bolts. The next month they get them from Lord knows where.



    C4

    Grant,

    Do you have any idea how mnay BCG manufactureres exist? Are there a slew of them or just a small number who end up supplying various weapon mfg's?

  9. #19
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    Quote Originally Posted by jmart View Post
    Grant,

    Do you have any idea how mnay BCG manufactureres exist? Are there a slew of them or just a small number who end up supplying various weapon mfg's?
    I really don't know for sure. I can think of 4 off the top of my head (not counting BCM as he uses CMT bolts and carriers). BM also makes their own bolts in house and to the best of my knowledge has the most failures of ANY manufacturer.

    Honestly, the only bolts I would stay away from are the bolts that BM makes in house and the DPMS bolt as they appear to use some kind of molded extractor.


    C4
    Last edited by C4IGrant; 08-08-07 at 13:23.

  10. #20
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    Sounds like the Bolt can stay.
    2012 National Zumba Endurance Champion
    الدهون القاع الفتيات لك جعل العالم هزاز جولة الذهاب

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