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The firing pin is one of those parts you never think about until it wears out or breaks, and then it's the only thing standing between you and a range day cut short. Armaspec built this one for AR9-pattern platforms out of 17-4 stainless steel and hardened it to the H900 condition, which is the toughest state that alloy comes in. Translation: it hits primers consistently and shrugs off the wear that comes with thousands of rounds.
H900 is the highest-strength heat treatment for 17-4, landing somewhere in the neighborhood of 40 HRC and pushing tensile strength well past what you'd get from a softer condition. That hardness is exactly what you want at the tip of a firing pin, where the metal repeatedly slams into primers. On top of the strength, 17-4 stainless brings solid corrosion resistance, so you're not fighting rust in the one spot of your bolt that sees the most abuse. It's a material defense and firearm makers reach for when parts have to survive rough field use.
Worth knowing up front: AR9 bolts run on blowback, not the locking, rotating action of a 5.56 AR15. Because of that, a 9mm firing pin is typically spring-loaded or biased rearward rather than left to float freely, which helps keep it off the primer as the bolt slams home. This Armaspec pin is cut to drop into compatible AR9 bolt assemblies, making it a clean choice whether you're doing routine maintenance, fixing a worn pin, or finishing out a build.
Keep one in your spare parts kit even if you don't need it today. Firing pins are cheap insurance, and having a quality stainless replacement on the shelf beats waiting on a shipment when yours finally gives out mid-season.
Yes. AR9-pattern rifles run on a blowback system with a one-piece bolt instead of the locking, rotating bolt of a 5.56 AR15. The 9mm firing pin is sized and shaped for that dedicated bolt, so it isn't interchangeable with a standard 5.56 pin.
H900 is the hardest condition 17-4 stainless comes in, reaching around 40 HRC with very high tensile strength. That hardness is ideal at the striking tip, where the pin repeatedly impacts primers. It helps the pin resist deformation and wear over a long round count.
It's designed to drop into compatible AR9-pattern bolt assemblies. AR9 designs can vary between manufacturers, so it's smart to compare your existing pin's dimensions before installing. If you're unsure about your specific bolt, check it against the original part first.
17-4 stainless gives you solid corrosion resistance in a part that sees a lot of friction and fouling. Paired with the H900 hardening, you get a pin that holds up to both wear and moisture better than many basic replacements. It's a good pick for a spare kit or a build you plan to run hard.
| UPC | 810048491636 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | ARM682-SS |
| Color | Silver |
| Model |
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