Home CMMG Why 5.7? || 5.7x28mm vs 5.56x45mm

Why 5.7? || 5.7x28mm vs 5.56x45mm

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20 COMMENTS

  1. One of the biggest boons for 5.7 in my opinion is actually the P90 itself as a bullpup. My full rifle length PS90 is about the same length as my 8'' SBR AR in 5.56. At these barrel lengths the difference in performance is negligible at best, but crucially I don't need to worry about a tax stamp, crossing state lines, having the gun on a registry (which we know doesn't exist /s) and I can use the same can I already have for my 10/22 with only a minor change to the barrel should of the PS90, To say nothing of the markedly lower recoil and ambidextrous nature of the platform

  2. I gather that the 5.7×28 round is lighter and the ration of projectile weight to powder is smaller than 5.56 and similar rounds. Which makes it a faster round, generally.. Right? If its a faster round, does that mean it travels in a flatter trajectory? (I guess that doesn't matter at short range.)

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