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Anybody who has fought a stubborn pivot pin during an AR build or a field strip knows the standard mil-spec setup leaves room for improvement. Armaspec put some real thought into fixing that. These Enhanced Takedown and Pivot Pins are machined from steel and treated with a black nitride finish that resists corrosion and wear, so they hold up to years of opening and closing your receivers. They fit most mil-spec AR-15, M16, and M4 lowers, making them a clean drop-in upgrade for a build or a refresh on an older rifle.
The convex head is the first thing you notice. It lets you tap the pin in from just about any angle instead of forcing you to line up perfectly, which speeds up assembly. On the other end, the extended concave tip gives you a solid purchase for removal using a flat blade, a punch, or even the tip of a bullet if that is all you have on hand out in the field. It is the kind of design detail that makes maintenance less of a wrestling match.
If you have ever launched a detent spring across the garage during an AR build, the patented EZ-Set hole will feel like a small miracle. It simplifies dropping detents into place and keeps things seated where they belong during installation. Builders consistently point out how easy these go in, with tight tolerances and no rough machine marks to fight through.
One thing owners appreciate is that the detents run stiff right out of the package and wear in over time, so the pins stay locked and will not pop open on you when you don't want them to. Between the finish, the fit, and the thoughtful shaping, this is a straightforward upgrade for anyone who values quicker, cleaner field stripping and reassembly.
Yes, these pins are designed to work with most mil-spec AR-15, M16, and M4 lower receivers. If your lower follows standard mil-spec dimensions, they should drop right in. As with any lower parts, tolerances can vary slightly between manufacturers, so a snug fit is normal and often preferred.
The big differences are the convex head that lets you tap the pin in from any angle, the extended concave tip for easier removal with a flat tool or bullet tip, and the patented EZ-Set hole that simplifies dropping in the detents during installation. Those touches make building and field stripping noticeably less frustrating than fighting with plain mil-spec pins.
Yes, the detents tend to run stiff straight out of the package, and that is by design. They wear in with use and keep the pins securely seated so they will not accidentally open on you. If anything, that firmness is a good sign the pins are holding tight.
The set includes one pivot pin, one takedown pin, two detents, and two detent springs, so you have the full hardware to install both pins. You will just need basic tools like a punch or flat object to seat everything. The EZ-Set feature is meant to keep those small detent springs from getting away from you during the process.
| UPC | 810048491254 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | ARM137-BLK |
| Color | Black |
| Product Type | Takedown Pins |
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