Wilson combat's full-size 5".45 acp shooting 230 gr.Hardball equivalent or standard pressure jhp self-defense ammunition or 10mm shooting target ammunition with a power factor of 175,000 to 195,000 ( velocity x bullet weight = power factor ).This is a balanced kit containing two shok-buff buffers and one heavy duty recoil spring.The shok-buff should be changed out every 1,000 rounds and the recoil spring every 2,000 rounds.

Finish: Silver
Type: Shok Buffer Recoil System
Model: Shok-Buff Kit
Dimensions: 5" L
Size: 45 ACP
Material: Steel