Now that dual recoil spring assemblies are becoming more and more common, I have to ask what advantage does it actually have over a traditional single spring set-up which is rated at the same strength?
Physically, in terms of performance there should be no difference. Dual recoil spring assemblies simply divide the job of one strong and long spring amongst two shorter and weaker springs. Logically, dual recoil springs are handy in smaller guns where it is tough to fit a single strong spring, but are they really truly any better to use in full size guns that can fit a single recoil spring rated at the same strength? Glock Gen 4's come to mind, of course but there are many others that use dual springs as well.
Physically, in terms of performance there should be no difference. Dual recoil spring assemblies simply divide the job of one strong and long spring amongst two shorter and weaker springs. Logically, dual recoil springs are handy in smaller guns where it is tough to fit a single strong spring, but are they really truly any better to use in full size guns that can fit a single recoil spring rated at the same strength? Glock Gen 4's come to mind, of course but there are many others that use dual springs as well.