The pre 13 rifles had fully adjustable triggers, meaning there were no limits on the adjustments and some people were adjusting them so lightly they would not re-set after they were fired. This reportedly required sending back to Beretta for repair, however I have owned 3-4 of them and adjusted them all fairly light without issue. The post 13 rifles had a limiting screw for the weight adjustment so they could not go as light, a different safety lever, and a different butt pad. I have owned 2 post 13 versions as well and I much prefer the pre 13, and currently am in the market for a 20” 308…