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8/15/2013 5:20:40 AM
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It was my understanding that longer barrels caused greater overall accuracy, but less muzzle velocity. This resulting from the friction created when the round grips the rifling as the round travels through the barrel.
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In general, FoMan is right. For most guns, longer barrel length means greater muzzle velocity. At some point though, the barrel will have enough volume that the gas isn't expanding enough to negate the friction. For instance, a 9mm round might have trouble exiting from a 30-40 ft. barrel. Example: Weapon Muzzle velocity Barrel length MP5A2 400 m/s 8.9 In. MP5K 375 m/s 4.5 In. That might be a small difference, but we are talking about a 9mm round.
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由FoMan123编辑： 8/16/2013 7:36:12 AMThe friction created by the rifling is utterly miniscule with hot, near-liquid copper (and/or lead) when compared with the massive extra boost provided by more room for the expansion of explosive gases directly behind the round instead of harmlessly into the atmosphere. If your understanding was correct, then on the whole, pistols would have much higher muzzle velocities than long rifles, which is obviously completely untrue.
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I am not trying to imply that the difference is significant enough that the muzzle velocity of pistols would be greater than the muzzle velocity of a long rifle, but the muzzle velocity of long rifles results from the design and caliber of the cartridge. Pistol rounds (typically) have an entirely different shape that is not nearly as aerodynamic as a rifle round. Cartridge design being the primary source for the overall muzzle velocity.
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This was my understanding as well. But the more I looked at that newly barreled weapon, the more I got this nagging suspicion that the front end could possibly weigh enough more that the accuracy would be compromised. Clearly over-thinking on my part :)
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由external编辑： 8/15/2013 11:13:20 PMIn this case added weight could add to accuracy and damage, but simply mean the weapon's more cumbersome; a longer barrel negatively impacting draw(swap) speed and/or reload speed (though the latter makes less sense given as you don't have to move the entire weight of the weapon to reload). Could be offset by a sling or other accessory affecting draw speed. In Brink I believe slings improved draw speed while making guns a little less accurate, the rationale being they slightly affected weight balance. Front grips did the opposite. Not sure if this affected both ADS and hip-fire spread/bloom or just the former.
