I have an AR-10T that was broken in properly and has been shown to print sub MOA groups only a few months ago (around 40 shots through gun) with factory ammo (Federal GMM 168 SMK BTHP). I am not a reloader so using factory ammo.
All of a sudden (100-150 shots through gun) my groups are stringing vertically where before they were cloverleafs or horizontal lines. Also, my cold bore shots are terribly high, sometimes +2"!! What gives?
Only things changed from then to now are:
-temperature +40
-went to PRI gas-buster charging handle
Background: This is my first AR and my first high-power.
All content of this site is copyright 2003 - 2017 AR-10(T)™, AR-10™, are trademarks of ArmaLite, Inc.® AR10T.com is NOT endorsed or affiliated with ArmaLite, Inc.®
About AR10T.com
AR-10(T) is a community focused on rifles, optics, scopes, gear, accessories, and components used by the professional operator and skilled marksman. Enthusiasts, shooters, and gunsmiths alike contribute to our gallery, articles, and reviews Thank you for visiting!