Approximately 20% extra power over the factory spring for smoother, more reliable feeding. Longer than factory spring; cut to fit most magazine tubes. In addition, .38-.40 will also fit many .30/30 and .32 Special rifles, .44-40 will also fit many heavy .45 caliber rifles, inlcuding .45/70 and .45/90.

SPECS: Tempered spring, 40" (110cm) long. Fits Win. 66, 73, 92, 94, Marlin 93, 94, 336.