@ 40 inches.
It depends.. if you have a carbine length barrel and will be using it on a rifle with a carbine length barrel, then yes. If you took it from a rifle with a rifle length barrel, and are putting it on a rifle with a carbine length barrel, then it won't function properly.
No. A standard AR15 has a buffer tube that runs inside the stock that contains the recoil spring.
multiply the force with length.
On the AR15/ M16, the spring is retained by the buffer. The buffer is retained by a pin located at the lower outer edge of the extension tube.
depends on the initial length of the spring, and how much force is required to stretch the spring
A mid-length upper receiver uses a mid-length gas system. The barrel length is between 14.5 inches and 18 inches, and the handguards are slightly longer to accommodate the gas system.
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no this will not improve the length of your backhand spring sit ups and crunches are more likely to improve the length of you're backhand spring
The larger the force pulling on a spring, the greater the length in the spring and the more energy that is stored in that spring. When looking at a spring there is a gradient that determines how much force much be used to sqeeze or stretch a spring a given amount. When a spring is stretched, the greater the force that is applied, the greater the change in length of the spring and the greater the amount of energy that is stored in the spring. A link is supplied to the Wikipedia article on the spring (device).