Originally Posted by Any Cal.
Spring specs seem to vary, but in general the rated weight in Glock springs is the spring force at full compression, not the installed length.
Then it is far less than 17lbs or 23lbs at full battery. And it would be a bit more involved to understand the actual force at full battery on a stock spring vs. a replacement spring (perhaps even a variable or torsional spring). Such data never got quoted to compare and we replace them at will.