KNS Hammer and Trigger Pin 2nd Generation Non Rotating AR-15 Stainless Steel

The KNS Precision 2nd Gen Non-Rotating Hammer & Trigger Pin Set for AR-15 tackles a real problem: hammer and trigger pin rotation that damages receiver holes and degrades trigger function over time. If you've built or rebuilt an AR-15—especially with 9mm conversions, suppressed uppers, or older M16 and pre-ban receivers—you know that pin walk isn't just annoying; it can compromise accuracy and ruin valuable receivers. KNS Precision's redesigned system uses anti-rotation links and a notched hammer pin that work together to lock pins in place and handle the extra forces these configurations demand.

What makes this stainless steel set stand out is the engineering: the hammer pin features a notch that locks into slots in the anti-rotation links, while the trigger is secured with locking screws and includes lubrication ports to keep everything running smooth. The anti-rotation links mount on the outside of the receiver, eliminating movement entirely. All pins are CNC-machined, centerless ground for uniformity, and heat treated to handle the job long-term. Whether you're protecting a pristine pre-ban receiver or just want bulletproof trigger control on a modern build, this system delivers.

KNS offers three sizes to match your receiver: Standard .154" pins drop in without any modification, Oversized .155" pins tighten up slack in worn or looser receivers and improve trigger feel, and .170" pins for larger receivers (note: oversized and .170" pins require the optional 3.95mm Reamer). Pick the size that fits your build, and you'll get the rock-solid pin retention that AR shooters demand.

Key Features

• Anti-rotation links lock hammer and trigger pins in place to eliminate rotation and receiver damage
• Notched hammer pin design prevents wear to valuable M16 and pre-ban receivers
• Handles the added stress of 9mm conversions and suppressed .223 uppers
• Trigger secured with locking screws and lubrication ports for proper maintenance
• CNC-machined, centerless ground, and heat treated stainless steel for durability
• Available in three sizes to match standard, worn, or oversized receiver holes
• Standard .154" size requires no receiver modification; drop-in ready

Specifications

Frequently Asked Questions

Will this pin set work with 9mm AR conversions and suppressors?

Yes. The KNS Precision 2nd Gen system is specifically designed to withstand the additional forces exerted by 9mm conversions and suppressed .223 upper receivers, making it ideal for these builds.

Can I install the Standard .154" pins without modifying my receiver?

Yes. Standard .154" pins drop in and require no receiver modification. If you need the Oversized .155" or .170" pins, you'll need to use the optional 3.95mm Reamer to enlarge the holes.

What's the difference between Standard, Oversized, and .170" pin sizes?

Standard .154" pins fit most receivers as-is. Oversized .155" pins tighten up trigger slack in worn receivers or newer builds where there's some play, improving trigger control and accuracy. The .170" size is designed for larger receivers.

Will this protect my pre-ban or M16 receiver from damage?

Absolutely. Preventing pin rotation is critical for valuable pre-ban and M16 receivers, as pin walk causes wear to the receiver holes. The anti-rotation links and notched hammer pin design eliminate rotation entirely, protecting your investment.