M16/M4 NON-ROTATING SEAR PIN Reviews & Ratings

Steel pin replaces original pin and locks into place against the take-down pin on M16/M4 rifles to prevent rotation and wear on receiver holes. Drop-in installation requires no tools or gunsmithing. SPECS: Steel, matte black phosphate finish. Fits M16/M4 receivers only.

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5 Stars

33%

4 Stars

17%

3 Stars

2 Stars

1 Stars

50%

Reviews Summary

The M16/M4 Non-Rotating Sear Pin generally receives mixed feedback. While some users appreciate its fit and performance in compliant receivers, others face issues with tightness leading to binding. Despite its solid build quality, inconsistencies in dimensions across different firearms can hinder functionality. Ensure compatibility before purchase for optimal results.

What Reviewers Are Saying

Product Fit and Functionality

60%

Several reviewers highlight the fit and functionality of the M16/M4 Non-Rotating Sear Pin when used in compliant receivers, with some achieving perfect installs. However, others noted tight fits leading to binding, indicating that proper integration depends on specific receiver specifications.

Quality and Construction

65%

Many reviews praise the overall quality and construction of the product. Users commend KNS for their typical manufacturing standards, although some reported issues with incorrect dimensions that affected performance, demonstrating that quality can vary depending on the specific unit.

Compatibility Issues

45%

A significant concern raised is the compatibility with various firearm models. Some users found the product only functions well with certain Colt models, emphasizing the importance of verifying specifications before purchase to avoid potential functionality issues.

Customer Experience

50%

Feedback on customer experience has been mixed, with some users reporting satisfaction with their product performance while others expressed disappointment due to defective installs. This indicates varying levels of satisfaction based on personal experiences.

Installation Challenges

55%

Installation issues are a common theme, with multiple reviewers noting problems related to tight fits that hinder the product's operation. These challenges contribute to frustration and could deter potential buyers if not addressed accurately in product descriptions.

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Not all recievers are created equal

I hardly ever write a review, but this product fits and works perfectly in my Sendra receiver. Which is true mill spec. You can't blame this product for the receiver manufacturer drilling the pin hole in the wrong place. And yes a little bit matters.

This part is better than you think!!

As I have a bit of a difference in my experience with this part, I'll let it suffice to say the following: Each and every "Mil-Spec" receiver has it's own minute differences. With a thousandth diff in spec from one to another, can easily cause the binding described by others. The one I installed in a Spike's Lower was fitted properly and works as expected. The customer was very satisfied, as are the community being protected by him...

Works fine in a few NFA receivers

I have not had an issue with a few Colt A1/A2s and some other NFA RR installs. Could be a tolerance stackup in both the receiver as well as the KNS part. It is worth saving the NFA item either way.

Limited fitment

This only works on Colt. I was told by KNS Built off Colt specs. Make sure your sear pin on right side of lower is directly above your safety ( 12:00 position ). Or this will be worthless!

Not living up to the KNS reputation

KNS prides themselves on tight fit but the sear anti rotation pin was TOO tight. The sear could not rotate when installed on the KNS pin, resulting in no auto fire and uncontrollable falling of the hammer with the bolt carrier in auto. I got a few of these to have in stock, they are all going back.

VERY DISAPPOINTED

I was surprised and disappointed with this product. After using KNS products for years in both duty and personal weapons without any problems I was surprised this product did not work. As usual for KNS, it is well made. However I found the arm / plate was too long, making an extremely tight fit. There was so much tension on the pin that it caused the auto sear to bind, thus becoming inoperative. Attempted to install in 2 different Colt M-16A1's with the same result. KNS makes great products but the mensions on the 1 I received were not correct for a proper fit and function.