Variable recoil springs are wound with lower rate at the beginning of compression, and gradually increase as the spring is compressed more. That is, they start off at a set weight, then get progressively heavier as the spring compresses.
Standard springs have the same rate from beginning to end.
I have seen no advantages to using a variable rate spring IMHO.
Standard springs have the same rate from beginning to end.
I have seen no advantages to using a variable rate spring IMHO.