Building an AR-platform rifle specifically for deer hunting has become one of the most popular projects among hunters who already appreciate the modularity of the AR system. Unlike a bolt-action deer rifle you buy off the shelf, an AR build lets you choose every component — caliber, barrel length, optic, stock, and trigger — to match your hunting style, terrain, and shot distances. But a successful build isn't just about picking parts you like. It requires a plan. Here's how to appro …