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5.56 and barrel length

Start with long barrel, take measurements. Cut 1″ off barrel, take measurements. Repeat. Due to NFA laws, it stops at 16.5″.

6 Responses to “5.56 and barrel length”

  1. ben Says:

    16.5″? Why not stop at 16.05″?

  2. Standard Mischief Says:


    I’m worried the lack of even a light deburr and lapping after each chop somewhat affected the velocity. Particularly from that last little uptick on the end.

    It would be interesting to know if they fired the Blackhills ammo last, as it has the least bumpy curve. Last would seem to indicate that a lapping effect was occurring from the prior ammo.

  3. Standard Mischief Says:

    >Why not stop at 16.05″?

    The ATF lab would dip the barrel into liquid nitrogen, measure it, and get a conviction.

  4. Lyle Says:

    Someone needs to learn that the words “than” and “then” are different words with completely different meanings. In the article, the word “then” is used almost every time where “than” would have been correct.

    The problem is in the fact that we’re expected to trust the numbers, while the words are frequently and obviously wrong.

    So can we safely assume that the numbers were carefully reviewed and edited while the words were not? Just askiní.

  5. Bill Says:


    Fair enough. I wrote the article and happen to be more of a numbers guy. I’ll review the grammar and update it accordingly. I can tell you with 100% certainty those are the numbers we collected. We spend the majority of time making sure the data we present is correct.

    Thanks for the feedback,

  6. jon spencer Says:

    They could have done this with a AR-15 then switched to a pistol lower.