[e-luder]

I actually don't like that recoil spring because of its inherent ability to over-coil. It tends to unscrew the spring guide plug. I like using the Shooter's Design ones. They don't over do it with the coiling because they are shorter and more stiffer. But that's just me.

But what recoil doesn't over-coil, right???

For the Guarder spring, you'll need at least two of the SA buffers which is translated to about 5-6mm of length on the spring guide. Take into account length of the compressed spring coils during the cycle as well.