Luger recoil springs varied in both the number of coils and the weight of the wire used.
I believe that the published data "17 to 21" refers to the number of coils not pounds...
Take a look at the table in our FAQ.
Compression poundage is up in the 50's...
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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