A friend and I took his new .300 blackout AAC upper and pwc lower. The rounds were Remington 220 grain sub sonics and a kahles 1.5-6x42. Well the first thing is the stock trigger has a ton of creep! During sighting it in at 100 yds, the bullet was hitting 3 inches in three different direction from center. So I'm Asking if the creep is excessive should I get a trigger and what kind or different brand?