AR pistol的子弹初速损失挺大的(-1000fps),不过近距离应该依然可以超过2000fps。
https://www.guns.com/news/2012/08/14/are-ar-pistols-worth-buying
ARE AR PISTOLS WORTH BUYING?
WHAT IS LOST?The short barrel shortens the sight radius. That makes iron sights less reliable. The shorter barrel is harder to control, as there is less mass to the rifle (and mass eats up recoil). The buffer tube sticking out of the end of an AR pistol is odd. It isn’t a stock, and it can be useful as a support point or a hindrance (as it sticks way out there). The folks at Ballistics by the Inch have put the .223 to their rigorous tests. The results suggest a significant loss of energy as the barrel shortens. From an 18-inch barrel to a six-inch barrel there is almost 1,000 fps that vaporizes at the muzzle.
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