Coil count is important, as well as wire diameter - together, that's what determines your spring tension, over a given length.
If you have a spring that's 12" long, and it has 5 coils, it's gonna be a bitch to compress. If you have a spring that's the same length, and 30 coils - it'll be easier to compress, but not as stiff as that first example. Coil count matters.
If you have a wire diameter in that 12" spring that's 0.010", that's tiny, like ink pen springs. You have a wire diameter of 0.072", and that's a proper recoil spring size. Smaller makes it weaker, larger makes it stronger.
This stuff really does matter - and there are SO MANY companies that don't even have a clue.
That's why I switched everything out to the Armalite parts. One source, one manufacturer, and it's from a company that really understood what they were doing when it was all developed in the first place.