AR 15 16 寸管 (Mid length gas tube) 和 20寸管 (Rifle length gas tube) 的spring 和Buffer 可以通用吗 ?
我用一个AR lower, 换不同的upper . 一个是16 inch barrel (Mid length gas tube)另一个是20 inch barrel(Rifle length gas tube), 会有问题吗?
找到这个: https://www.at3tactical.com/blogs/news/9298047-carbine-mid-or-rifle-a-beginner-s-guide-to-ar15-gas-systems
What is the Correct Gas System Length for my Barrel?
The below chart shows the typical gas system lengths (distance from receiver to gas port) and how the pertain to barrel length. As you can see there are wide ranges here, typically the closer that the barrel length is to the middle of the range, the better it will function (example 14” barrel with a carbine length gas system).