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Anti-Walk locking pins replace your AR trigger and hammer pins to ensure pins do not rotate or vibrate loose out of the receiver. This is a popular inexpensive and drop-in enhancement for tactical hard-use guns and full auto firearms. These pins are compatible with a standard USGI style AR style lower receiver with standard GI trigger pins of .154 diameter regardless of caliber including 7.62/.308 length AR receivers. Features: Anti-walk/rotation Fits standard USGI .154 diameter pin receivers Black finish Made in USA