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Reviews & Ratings for KNS Precision PERMA Firing Pin Retaining Pin — 17 reviews

(17 reviews)
KNS Precision PERMA Firing Pin Retaining Pin
KNS Precision PERMA Firing Pin Retaining Pin
$12.00 $9.50 Save 21%
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Most Helpful Positive Review KNS precision
Easy installation an overlooked but excellent reliability upgrade for AR15 BCGs for the price its well worth it. Well made and will definitely look at other products KNS makes for AR platform. Just because you break a part when trying to install dosent mean the part is bad maybe you installed it wro...
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Most Helpful Negative Review Broke very easily during first instalation.
Broke very easily during installation. I was very surprised how easy the end of the pin broke off. I didn't tap it and just pushed with my thumb. Seemed very brittle. It never even made it through its first installation. I'm a gunsmith and 3 gun competitor and will just stick to standard cotter pin...
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Easy Install

by Steve, Verified Owner from NJ, United States Written on April 18, 2025
The pin is easier to install on new builds and fits nice and flush up against the bolt carrier.
Pros:
  • EASY INSTALL
Cons:
  • Need bit of leverage to get it out
Would recommend: Yes
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Firing, pin, retaining pin

by Darrell, Verified Owner from PA, United States Written on February 16, 2024
Did not like the Carter keys that go in the bolt carrier too hard to put in . This is an Awesome product easy to use.
Would recommend: Yes
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Did not work for very long

by Keith, from FL, United States Written on October 30, 2023
When my original cotter pin got distorted enough to be difficult to insert, I bought this fancy version thinking it was a low cost but durable replacement. Goes in easily and seemed to fit well, but here I am about 200 rounds later and I have to replace it. For whatever reason, it will not stay in the bcg, and just falls out. Fortunately this didn’t happen during a critical period. I will avoid these in the future and will not recommend them to anyone else.
Would recommend: No
1 of 1 found the following review helpful.
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Wouldn't fit initially, now it falls out on it's own

by c ross, from MI, United States Written on September 30, 2023
Not a very good product. Maybe it would have been smarter if they had just used a threaded bolt with a conical nut, but whatever the reason, this was near impossible to initially get into the bolt carrier, and now it falls out when the BCG is but tipped on its side. I guess that's fine when it's inside the receiver, but as soon as you take it out, it's easily lost. The reusability concept is nice, but if you lose it, it doesn't matter how reusable it is.
Would recommend: No
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Worth The $ To Upgrade Pin

by NATHAN CUNNINGHAM, from PA, United States Written on May 12, 2021
Ive put about 700 rnds of anmo through my rifle while using this pin and I havnt had any issues. Seems to be well made and better than stock pin. I knocked 1 star off because it can be a pain sometimes getting the pin to line up but usually after couple trys it goes right in
Pros:
  • well made
  • EASY INSTALL
  • KNS Brand
Cons:
  • Can Be Hard To Get Lined Up
Best Used for:
  • Ar15 BCG
Would recommend: Yes
2 of 2 found the following review helpful.
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Broke on installation

by Roy, Verified Owner from OK, United States Written on April 19, 2021
I do not recommend this retaining pin from KNS; fit is too tight. One of the tabs broke off when I tried to install it. I went back to search and found the original Stoner design retaining pin online at Iron City Rifle Works. You get two for the price of one (Of one the KNS pins) and it fit beautifully and is easy to remove and re-install during cleaning. Win! Win!
Pros:
  • None
Cons:
  • Way too tight
Would recommend: No
3 of 3 found the following review helpful.
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Good idea, ...

by Jeff Bryce, Verified Owner from IL, United States Written on April 5, 2021
... but it would be nice if it A) fit properly and B) did not break during installation. It fit extremely tightly on initial installation and one of the tabs on the tip broke off without ever being fully installed let alone used at all. I suppose I'll buy regular cotter pins in bulk for what this cost.
Would recommend: No
1 of 1 found the following review helpful.
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outstanding and simple upgrade

by freedombirdies, Verified Owner from IA, United States Written on March 30, 2021
I don't know how these are in stock. It's such a great upgrade to any BCG. Those retaining pins are a huge pain in the butt and these KNS pins are a life saver. It's not just a matter of convenience - the KNS pins are also sturdier than regular retaining pins. Buy them before I have them all.
Would recommend: Yes
4 of 4 found the following review helpful.
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Perma pin firing pin retainer

by Meiko Madera, Verified Owner from TX, United States Written on February 20, 2021
Better off buying literally any other retaining pin. Will not go into my bolt carrier regardless of what I do. Package says easy installation, buy will not install at all. Completely useless and not even good enough to be a paper weight.
Pros:
  • None
Cons:
  • Dosent work like it should
Would recommend: No
0 of 1 found the following review helpful.
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Good Pin Replacement

by Diego, Verified Owner from CA, United States Written on December 17, 2020
It's a retainer pin replacement that sits sort of flush with the bottom of the retainer pin divot. I don't expect it to come loose any time soon since it has such a tight fit, so I suppose if you're looking for a cotter pin replacement, this would be the way to go.
Would recommend: Yes
1 of 1 found the following review helpful.
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