Out of the box, the AR-15 is action ready. Whether you are ready to plink, hunt, or defense your castle, a stock out of the box AR-15 will get the job done. However, who wants to settle for a rifle the peaks at getting the job done? Likely, the best money you can spend on your AR is a simple to install, drop-in trigger upgrade. Here are our top 10 choices to improve your accuracy.