The AR-15 A4 Lock Washer – Silver Stainless Steel (Part #160308151) is a small but critical component designed to securely retain your muzzle device on standard AR-15 barrels. Made from corrosion-resistant stainless steel with a clean silver finish, this lock washer helps keep your flash hider, muzzle brake, or compensator properly seated under repeated firing, heat, and vibration.
Secure Your Muzzle Device the Right Way
On an AR-15 A4–style build, every part at the muzzle has a job—and the lock washer is the quiet hero that keeps everything in place. This AR-15 A4 lock washer is designed to:
Help prevent muzzle devices from backing off under recoil and vibration
Maintain consistent tension between the muzzle device and shoulder
Provide a more secure interface than running a bare muzzle device against the barrel shoulder
Whether you’re installing a classic A2 flash hider or a simple thread protector, a proper AR-15 A4 lock washer is an easy upgrade for secure, repeatable mounting.
Stainless Steel Construction for Long-Term Durability
Unlike cheap, soft washers that deform or corrode, this AR-15 A4 lock washer is made from stainless steel for strength and longevity:
For duty rifles, defensive builds, and hard-use range guns, stainless hardware provides extra confidence that your muzzle device stays tight and serviceable.
A4 Pattern – Made for Standard AR-15 Builds
This lock washer is tailored for AR-15 A4–style rifles, making it ideal for:
Clones and mil-spec-style A4 builds
General-purpose AR-15 carbines and rifles
Refurbishing or upgrading existing rifles with fresh small parts
Typically used in conjunction with:
If you’re completing a parts list for an A4 upper or refreshing an older barrel assembly, having the correct A4 pattern lock washer is a must.
Easy Installation with Common Tools
The AR-15 A4 Stainless Lock Washer installs just like standard AR muzzle hardware:
Ensure firearm is unloaded and safe.
Slide the lock washer over the barrel threads, seating it flat against the shoulder.
Thread on your muzzle device by hand until snug.
Use an armorer’s wrench or appropriate tool to torque the muzzle device to spec, compressing the washer slightly.
Because it’s stainless steel, it provides firm spring tension while still allowing you to clock (time) your muzzle device correctly, especially with simple muzzle devices that don’t require precision shims.
If you’re unsure about installation, have a qualified gunsmith or armorer install your muzzle device and washer.
Perfect for Builders, Armorers, and Spare Parts Kits
Small parts like lock washers always seem to go missing right when you need them. Keeping extras on hand is a smart move:
Home builders assembling or re-barreling AR-15 uppers
Armorers & gunsmiths who service multiple rifles
Range and training facilities that maintain a fleet of AR-pattern guns
Shooters building spare parts kits for their go-to rifles
This stainless A4 lock washer is compact and inexpensive, but it’s essential for proper muzzle device mounting, especially on rifles that see frequent barrel or muzzle device changes.
Key Features – AR-15 A4 Lock Washer Silver Stainless Steel
Product: AR-15 A4 Lock Washer
Part Number: 160308151
Platform: AR-15 / A4 pattern
Material: Stainless steel
Color / Finish: Silver (natural stainless)
Use: Retains and tensions AR-15 muzzle devices (e.g., A2 flash hider, brakes, compensators, thread protectors)
Benefits:
Helps prevent muzzle devices from loosening
Corrosion-resistant material for long-term durability
Ideal for A4 builds, repairs, and parts kits
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