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找到答案了,稍微google了一下https://www.ar15.com/forums/ar-15/Difference_between_AR15_rifle_and_carbine_stock_assemblies/128-668161/
Traditionally, 18" and longer barrels are typically mated with a fixed rifle stock. 16" and shorter are mated to collapsible carbine stocks. Barrel length and stocks are independent of one another, so you can mix and match for your personal preference. The stocks mount to the receiver extension. Carbine extensions are shorter, thus a shorter spring and buffer than a rifle setup. Mid-length refers to a gas system that is between a carbine and rifle. It has nothing to do with which stock you pick. Pistols can't have a stock, so they just have a buffer tube only. SBR's refer to barrel length, so again, you can use which ever stock you like. I don't think I have ever seen a SBR with a rifle stock, but you certainly could if you wanted to. I hope that all makes sense.
Carbines are by nature, compact, thus the collapsible stock.
Rifles are by nature, not compact, so one doesn't mind a longer, fixed stock.
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