Twin concentric springs for extra cocking effort with no discernible increase in muzzle velocity.Originally Posted by Neil.
Yup
Double concentric springs, according to "Great Universal Catalogue" circa 1975...
Lord of the Springs
Twin concentric springs for extra cocking effort with no discernible increase in muzzle velocity.Yup
Double concentric springs, according to "Great Universal Catalogue" circa 1975...
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