Worked
Have an old msr that had sloppy upper to lower play. I bought a pin that took up the slop with a wedge system pin that required a hex key and screwdriver. Locked the two up solid.. It’s installation required removal of detent pin and spring and that was done easily enough with a dental pick. But it would loosen up shooting. And was a pain to remove for cleaning I wanted an easier to remove pin. Wanted to reinstall regular takedown pin. This old msr doesn’t have the normal castle nut but one with only one hole in nut. So dilemma was I couldn’t find the old wrench for that type nut in order to reinstall the detent pin and spring. Didn’t want to use pipe wrench or pliers and screw up nut.
Found this. Works great. Not as much play as the stock pin that was with msr when I got it. Tight enough and now back to easy cleaning.
A must have for polymer lowers
I use these exclusively on AR polymer builds. An overzealous disassembly resulted in a cracked plunger housing for the pivot pin, prompting a repair/solution-these pins are the solution. They do require lube per instructions.
Problem solver.
I bought a cheap receiver. Maybe it was before the drill bit was changed out, maybe it was made late on a Friday. The pivot (and receiver) hole(s) were too big. When I would move the gun around, the pins would fall out. Sure, I should have returned it to the manufacturer and requested a new one. But I didn't want the hassle and I figured there were more people out there like me. When I saw this, I bought both, and bingo, problem solved. Now the gun is tight, accurate, and I've taken both detent springs out of the equation (making me feel a little safer stripping it in the field). The push buttons haven't caused any issue, it's a great product.
Great item
I bought these after spending time looking for tiny detent that goes flying atleast once on assembly. They are kinda pricey but it makes up for your sanity when you apply on first time and no headache. They dont standout to much from regular take down pins. Really handy in my opinion.
Works with pre-ban Colt+PSA upper
I have a pre-ban (no bayonet mount on the original upper, and the block that makes trigger replacement problematic, but otherwise not too corrupted) Colt Sporter, and a couple of other uppers (16" stainless, and .300 AAC). Easy upper switching without a screwdriver (thin but wide, not what one usually has handy) was desirable for me. This push-button pivot pin solves that nicely; fits well, looks fine, easily removable with no tools. I had another pivot pin that had hand-knobs and a sleeve (to protect the upper from wear), but that would have required an extra sleeve for each upper, and they didn't sell the sleeves separately. This just works for me, without needing three of them. If this is your size (not all pivot pins are the same diameter!), and you want to be able to remove the pivot pin without a tool, this is the best solution I know of!
Saved a messed up lower
Long story cut short, I've got an AR lower where the detent+spring channel for the pivot pin (as in, the pin at the front of the lower receiver) is not exactly perfect... in fact it's just whacked. Skip how that got that way, but it means that I can't use a traditional detent+spring to keep the pin captive to the lower. The head of the pin, with it's clipped-circle shape, can only align one way when fully inserted (as you likely know: the receiver has a flat that mates with the flat on the clipped-circle of the pin head), but the detent being off-center prohibits that. I was planning some quantity of hectic modification to the pin (likely) or to the receiver (worst case) in order to overcome this, but then I remembered these KNS pins. Problem solved, it appears. If I find that the pin fails for some reason later on, then so be it, but for now it has saved me lots of time and it works.
Works well but...
The pin works well, great construction, very easy to use and potentially very convenient, BUT when installed, it sticks out so much that it interferes with my access to the safety lever! Turning it around does not help, the takedown pin needs to be very close to flush with the lower receiver in order to be out of the way of my thumb accessing the safety. I have a standard milspec Anderson lower with standard safety lever parts, and I can't use this pin!
