About this item This fits your . Make sure this fits by entering your model number. Secure, Quick, & Reliable Access When You Need It Most - Specifically designed rapid access finger code lock to prevent tampering and quick access to others while your gun is at the ready No batteries, electronics, or keys needed - The AR-15 Chamber Lock uses five actuators located on the corner of the enclosure for fast and easy indexing. Your hand creates the key that positions these actuators in the correct alignment to unlock the chamber lock Compatible with 223 and 556 calibers 100% Satisfaction Guaranteed and Lifetime Warranty - If you're not satisfied for any reason, you may return your order for a full refund within 30 days Made in the USA - Made from 6061 T6 Aluminum with Type II and Type III Hard Anodized allowing it to be extremely lightweight and durable