Recoil Calibration Packs are offered to allow the shooter a choice of recoil springs to calibrate the recoil function when the correct spring rating is not known. The shooter starts with the strongest spring and works down until the desired recoil function is obtained. Each Pak contains several recoil springs and offers a savings over buying them individually. Three extra power firing pin/striker springs are also included.
One each 18.5 lb, 20 lb, 22 lb, 24 lb recoil springs
Three extra power firing pin springs
Recoil springs are single springs, not double like the Colt Officer factory springs
Direct replacements for 45 ACP Kimber Pro Carry, Kimber Compact, Para-Ordnance P-12, Springfield Ultra-Compact, V10
Must use with .330 - .332 diameter guide rod in Colt Officer (not the stock guide rod)
Factory recoil spring rating is 22 lb
Do not use shock buffers with Officer recoil springs