Muzzle Devices
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A muzzle device threads onto the end of the barrel and changes how the rifle shoots: flash hiders (also called flash suppressors) cut the flash you see in low light, compensators and muzzle brakes redirect gas to reduce muzzle rise and recoil, and suppressor mounts give a suppressor something solid to lock onto. The thread pitch must match your barrel: 1/2x28 is standard for 5.56 and most 22-caliber barrels, and 5/8x24 for .30 caliber such as 300 Blackout and .308.
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Read our guide: How to Build an AR-15: Parts List, Tools & Steps
Muzzle Devices: common questions
Flash hider, compensator or muzzle brake: which do I need?
A flash hider for low light and home defense, a compensator to keep the muzzle flat for fast follow-up shots, and a brake to cut recoil on bigger calibers. Brakes and compensators are much louder for people beside you.
What thread pitch is my barrel?
Most 5.56 and .223 AR-15 barrels are threaded 1/2x28, and most 300 Blackout and .308 barrels are 5/8x24. Check the barrel's listing or markings before you buy.
Do I need a crush washer or shims?
Yes. A crush washer, peel washer or shims time the device so its ports face the right way, and many devices include them.