AR-15 Trigger Pin
The United Defense AR-15 Trigger Pin is a mil-spec replacement pin for the standard AR-15 fire control group. Machined from hardened steel and finished in black phosphate, it measures the industry-standard 0.154 inches in diameter for direct fitment in small-pin AR-15, M16, and AR-10 lowers. The retaining groove captures the trigger spring leg to keep the pin locked in place during fire. Builders, armorers, and AR shooters should keep one of these on hand as a critical spare for any trigger swap or lower build.
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- SKU
- 8448609-2
$2.25
Description
Features
- Mil-Spec .154" Diameter — Machined to the standard 0.154-inch small-pin spec for direct fitment in mil-spec AR-15 lower receivers.
- Hardened Steel Construction — Built from hardened steel to resist shear, deformation, and wear under repeated hammer and trigger cycling.
- Black Phosphate Finish — Corrosion-resistant phosphate coating matches standard AR-15 fire control group hardware.
- Direct Drop-In Replacement — Installs in seconds as a one-for-one replacement for a lost, worn, or damaged factory trigger pin.
- Precision-Ground Surfaces — Smooth, uniform pin surfaces keep trigger rotation crisp and reduce slop in the fire control group.
- Retaining Groove — Cut with the standard circumferential groove that captures the trigger spring leg and prevents pin walking.
- AR-15 / M16 / AR-10 Compatible — Works in any small-pin AR-15, M16, or AR-10 lower using a standard mil-spec trigger.
- Essential Spare Part — A must-have for builders, armorers, and anyone maintaining an AR platform at the range or in the field.
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Customer Reviews
Top customer reviews
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Great Item!....Fast Shipping!!This pin dropped right into my lower receiver without any issues or extra fitting. It feels very sturdy and the black finish looks great, though it is just a single pin so make sure you order enough for your build.
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Great Itemtrigger pins look great. Exactly what I needed.
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First-Class Manufacturing A++Best AR15 trigger pin for the price sold by a terrific company. Got my order fast and free shipping!!
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Great PriceFunctions great as a replacement trigger pin for my AR15.
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PerfectFinest AR15 trigger pin for the price sold by a awesome company. Thank you!
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