Your AR-15 build lives or dies on the details. You can drop money on a match-grade barrel, a crisp trigger, and a premium optic — but if you cap it off with the wrong muzzle device, you'll feel it on every single trigger pull. Muzzle devices sit at the very end of your barrel, but their job is anything but small: they shape recoil, control muzzle rise, manage flash signature, and influence how fast you can get back on target for a follow-up shot. Picking the right one isn't just a cosmetic …