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Thread: Rejection Rates for tested tier 1 AR15 parts

  1. #11
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    I was using MPI tests generically and any other test can be used interchangeably.

    This is very useful information and could be quite useful when helping one decide what carbine to purchase. Thresholds are very important and this could even be useful for comparing tier one companies. You bring up a great point: if we don't know what an individual company will accept, all simply suggesting they test it is very moot. Thanks for the input.
    Last edited by tylerw02; 07-20-09 at 16:32.

  2. #12
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    Quote Originally Posted by tylerw02 View Post
    I was using MPI tests generically and any other test can be used interchangeably.

    This is very useful information and could be quite useful when helping one decide what carbine to purchase. Thresholds are very important and this could even be useful for comparing tier one companies. Thanks for the input.
    Oh sure, but realize the following:

    1. Manufacturers are not going to share failure rates.
    2. Most "manufacturers" are nothing more than parts assemblers and do not ACTUALLY make anything. So they have ZERO idea what the actual manufacturer has done as far as testing.
    3. Most "manufacturers" really do not care if anything has been tested or not. All they care about is the "finish" and cost.



    C4
    Last edited by C4IGrant; 07-20-09 at 16:42.

  3. #13
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    Quote Originally Posted by C4IGrant View Post
    Oh sure, but realize the following:

    1. Manufacturers are not going to share failure rates.
    2. Most "manufacturers" are nothing more than parts assemblers and do not ACTUALLY make anything. So they have ZERO idea what the actual manufacturer has done as far as testing.
    3. Most "manufacturers" really do not care with anything has been tested or now. All they care about is the "finish" and cost.



    C4
    So what you're suggesting is that we have to rely on reputation and that all parts testing is moot if we do not know the acceptance/rejection threshold? That just because a part is tested (and stamped accordingly) we don't know that it is as good as or better than another brand that is also tested?

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    Quote Originally Posted by tylerw02 View Post
    So what you're suggesting is that we have to rely on reputation and that all parts testing is moot if we do not know the acceptance/rejection threshold? That just because a part is tested (and stamped accordingly) we don't know that it is as good as or better than another brand that is also tested?
    Basically, yes. I would rely on people that work in this industry to be able to spot quality from crap.

    I talk to instructors to see which brands of AR's go down the most (as these guys see tons of guns). This is another good way to tell.


    C4
    Last edited by C4IGrant; 07-20-09 at 16:41.

  5. #15
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    This is good information.

    I suppose I won't find good organized empirical evidence to suggest brand X over brand Y.

    My personal carbines are still awaiting their first failure. Of the three I mostly shoot, I have a 6920 and two frankenguns made of CMMG parts (with F/A BCGs with black extractor inserts)with Wilson Combat bbls. My current build is going to be mostly BCM parts. I've also considered purchasing an additional 6920 or a DD XV and this leads to me to believe there is no good way to compare the two.

  6. #16
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    Quote Originally Posted by tylerw02 View Post
    This is good information.

    I suppose I won't find good organized empirical evidence to suggest brand X over brand Y.

    My personal carbines are still awaiting their first failure. Of the three I mostly shoot, I have a 6920 and two frankenguns made of CMMG parts (with F/A BCGs with black extractor inserts)with Wilson Combat bbls. My current build is going to be mostly BCM parts. I've also considered purchasing an additional 6920 or a DD XV and this leads to me to believe there is no good way to compare the two.

    Yes you will. Look at Rob's Chart. The more "X's" next to the companies name means that more effort goes into the product.

    You cannot go wrong with BCM and DD.

    C4

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    Quote Originally Posted by C4IGrant View Post
    Yes you will. Look at Rob's Chart. The more "X's" next to the companies name means that more effort goes into the product.

    You cannot go wrong with BCM and DD.

    C4
    I understand that aspect, but even comparing BCM to DD to Colt which is better if we cannot know what parts are going to be rejected; we simply know that they test.

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    Not trying to be a pain here, just trying to gain a better understanding.

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    Quote Originally Posted by tylerw02 View Post
    Not trying to be a pain here, just trying to gain a better understanding.
    No apologies necessary. This is interesting. I want to know, too.

    For example, if testing barrels is SUCH a big deal, then why can't anybody give us a ballpark figure regarding how many barrels fail?! Yes, it DOES make a difference. Are 5% flawed? 50%? 0.5%?

    Bimmer

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    Quote Originally Posted by Bimmer View Post
    No apologies necessary. This is interesting. I want to know, too.

    For example, if testing barrels is SUCH a big deal, then why can't anybody give us a ballpark figure regarding how many barrels fail?! Yes, it DOES make a difference. Are 5% flawed? 50%? 0.5%?

    Bimmer
    Thanks. These questions have plagued me for some time. This would also provide good insight to the comparable quality (or lack there of) of tier two guns relative to top tier.
    Last edited by tylerw02; 07-20-09 at 17:34.

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