The CANiK® Full Size High Force Recoil Spring Assembly is produced for users who target optimum performance with higher energy ammunition. This recoil spring also plays an important role in directing the force of the recoil on the slide, helping you stay on target for faster follow up shots. This recoil spring is marked with red paint and the letter “H”, meaning it is intended to be used with 9x19mm ammunition operating below +P pressure specification.