Wilson Combat Anti-Walk Hammer/Trigger Set Pins Black. This is a popular inexpensive and drop-in enhancement for tactical hard-use guns and full auto firearms. These AR15 Lower Parts 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. Specifications for Wilson Combat Anti-Walk Hammer/Trigger Set Pins: Manufacturer: Wilson Combat Condition: New Features of Wilson Combat Anti-Walk Hammer/Trigger Set Pins Anti-walk/rotation Fits standard USGI .154 diameter pin receivers Black finish Package Contents: Wilson Combat Anti-Walk Hammer/Trigger Set Pins Wilson Combat TR-AWP-B: Anti-Walk Hammer/Trigger Set Pins Black