Lower Build (New Member)

[Frontier Gear]

I've sold or used hundreds of anti-walk pin sets. They have their place. They are not always needed, but are sometimes recommended.

Uses:

• Certain drop in triggers. Some like the JMT Saber need them. Others like Rise Armament recommend them.
  
• Polymer lowers. As already mentioned, the anti-rotation pins keep the hammer and trigger pin from rotating and moving back and forth. Those movements can wear out polymer lowers prematurly.
  
• Drop in triggers with Polymer lowers. Most drop in triggers use two set screws that press down on the floor of the lower to hold the trigger in place. This will deform a polymer lower. The fix is to use anti-rotation pins to secure the drop in trigger instead of the two set screws.
  
• Raw aluminum, such as 80% lowers. Even if the aluminum lower was anodized, where you drilled the hammer and trigger pin holes is no longer anodized. Some people feel that the lack of anodizing can cause premature wear in the hole, so they use anti-rotation pins to prevent it.
  
• Blowback ARs such as 9mm. For whatever reason these tend to elongate the hammer pin holes in a lower. Anti-rotation pins help with the issue.
  
• Messed up 80% lowers. A lot of people mess up on their 80% lowers. Using a drop in trigger with anti-rotation pins to help keep all the geomitry in place is a very common fix and can cover a multitude of sins.