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AR-15 PERMA PIN FIRING PIN RETAINER Reviews & Ratings

The KNS Precision AR-15 Perma Firing Pin Retainer was inspired by the design of the retaining pin found in the original AR-15 prototype developed by Eugene Stoner. The pin retainer ensures that the firing pin remains secured into place and works with any standard AR-15 bolt-carrier group. The pin retainer is made from heat-treated steel, which provides flexibility and strength. The pin cannot be used on .308 bolt-carrier groups.

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5 Stars

44%

4 Stars

3 Stars

Reviews Summary

The AR-15 Perma Pin Firing Pin Retainer garners mixed reviews. While many appreciate the convenience of its design, some users face fitment issues and installation difficulties. Durability is touted as a strength, but concerns regarding its compatibility with different bolt carriers dampen its overall appeal. Overall, it holds promise but requires refinements for broader acceptance.

What Reviewers Are Saying

Ease of Use

60%

Many users commend the Perma Pin for simplifying the replacement of firing pin retainers compared to traditional cotter pins, enhancing user experience. However, some still find it challenging to install properly, indicating variability in user experience.

Fitment Issues

50%

A significant number of reviewers report that the Perma Pin does not fit correctly in various bolt carriers, causing frustration and leading some to abandon the product altogether. This suggests a need for better design compatibility across different firearms.

Durability

45%

Users frequently highlight the durability of the Perma Pin, with expectations that it will serve longer than traditional cotter pins. Despite some installation challenges, the perceived long-lasting nature of the product is a major selling point.

Design Improvements Needed

40%

Several reviews indicate that improvements in the design, particularly related to the installation process, could elevate the product's performance. Suggestions include refining the split ends and ensuring easier alignment during installation.

Value for Money

30%

While some reviewers feel the price is justified given the benefits, others argue that the risk of fitment issues makes it questionable in terms of value, especially compared to cheaper alternatives. This suggests varying perceptions on cost-effectiveness.

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Works like a charm

Like that I don't have to fight with the cotter pin to go back in. Will have to see how long it lasts

by PHILIP ZIEGLER on August 17, 2024

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Retainer

This makes replacing the firing pin retainer easy.

Better than OEM

I used this Retainer on 6.5, 5.56, and .308 BCGs. Much easier to use than the cotter pin

The Perma Pin Is THE Way To Go

I was looking for something that replaces the standard cotter pin firing pin retaining pin because the cotter pin looks like it will wear out fairly quickly and, oh, yes, the Perma Pin is just the thing, the perfect thing, the long-lasting solution! Maybe that's why they call it the Perma Pin. It should last for a very long time. The Perma Pin is not the easiest thing to get in the hole. You have to play with it for a while to get it inserted in its proper location. KNS recommends working the Perma Pin in and out a few times just by itself with all of the other bolt carrier group parts removed, then assemble the bolt with all of the parts and insert the Perma Pin. On a scale of one to five, Perma Pin is probably a ten-star product. Yes, I recommend it. I think it is the best.

Didn't Work for Me

Did not fit my bolt carrier, as my opening for the firing pin retaining pin is more U-shaped, as opposed to the traditional round opening (see pic). This caused the lip of the Perma Pin head to catch on the edge of the opening before it could be fully seated. Tried it on a second bolt carrier, and it did not want to go through the far side. We could probably file it down a bit to make it work, but did not do that yet. Throwing it in the spare parts box for now, as it isn't worth the hassle of sending it back for $10. Great idea, and apparently similar to the original Stoner design, but did not work for me.

I agree a good idea if it worked!

If it fit into the opposite side of the BCG when inserted it would be great but it does not. One of the split ends broke off trying to push it into place. At least if a standard retainer breaks it is a 2 buck loss. This is $10. Only gave it two stars because whoever designed it if they had just tweaked the design a bit it would have been 5. As is do not waste your money buy 5 of the regular ones.

Waste of money

Bought this thinking it would be an upgrade but after being in my rifle and not shooting for a couple months I when to clean it again before a range day and the pin just fell out glad I didn't take it out before reinspecting it

A good idea poorly executed?

Tried to use this in my Stag. It did not seem to align correctly and could not be installed without the use of tools which is NOT recommended in the instruction. My concern is if it is that difficult to install what happens when disassembly is needed again. The item has been returned to Brownell's.

Good Idea but difficult to install

I had seen them on the HK so I purchased (5 ) took me over 15 minutes to install the first one. The next one I broke. You need a tool or small block of wood or plastic hammer to push them in/out very stiff. Returning the other 3. Sorry guys you need to polish the split ends better. I hope you all work out the issue. Sorry