@ 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.
If the length of the spring is halved, the spring constant remains the same. The spring constant is determined by the material and shape of the spring, and is not affected by changes in length.
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.
The spring constant remains the same regardless of the length of the spring. It is a physical property of the spring material and design, representing its stiffness. Cutting the length of the spring in half will not change its spring constant.
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.
The spring constant is directly proportional to the length of the spring. As the length of the spring increases, the spring constant also increases. This relationship holds true until a limit called the elastic limit, beyond which the spring may become permanently deformed.
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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