The MOD 2 rifle ships with the full weight (5.5 lb trigger pull) spring only. The lighter spring that is included in ZEV’s retail packaging (and listed here) will give you a lighter trigger pull, but can also increase the chances of light primer strikes with military ammo and with varying types of ammunition in cold weather conditions according to our extensive R&D testing in PWS rifles from this past year.
PWS customers purchase our products for reliability and reduced maintenance above all else. We believe the full weight spring is the best option for our rifles and is what we ship from factory. The crisp, clean pull of the 5.5 lb trigger is what we chose to put in our rifles and what we suggest our MOD 2 customers run. That being said, you can switch out the spring for the JP reduced power spring, but the use of the lighter spring will void the warranty of the rifle in regards to malfunctions related to this change in the rifles’ operating system. Your rifle is still under standard warranty through us, but if you experience malfunctions such as light primer strikes, we will not provide warranty services on the trigger to fix it.
Please visit http://www.zevtechnologies.com/ssrinstall.pdf for installation instructions.