SKU: EFMAR087
UPC: 811261024342
MPN: MAR087
The TacFire AR-15/M4 Style Takedown Pivot Pin & Detent Spring is a straightforward replacement kit for one of the most commonly lost components in AR-pattern rifles. Whether you launched your detent spring into orbit during a late-night build or need spares for your range bag, this USA-made set gets your rifle back in action. The kit includes both the front pivot pin and its corresponding detent spring, designed for drop-in compatibility with standard AR-15 and M4 lower receivers. We stock these because every AR owner eventually needs them.
TacFire machines this pin from steel to match factory specifications for the front pivot position. The included detent spring measures 26mm in length and provides the correct tension to keep your pivot pin seated during operation while still allowing smooth takedown. At just 0.1 oz total weight, this is the kind of part you toss in your grip storage or spare parts bin and forget about until you need it. The pin fits the standard receiver lug and works with both forged and billet lowers that use mil-spec pivot pin geometry. For builders looking to upgrade their takedown system, we also carry the TacFire Extended Steel Take Down Pin for easier manipulation without tools.
This kit solves a specific problem that afflicts builders, armorers, and anyone who has ever field-stripped an AR on gravel. Keep one in your parts kit at the workbench and another in your range bag. The pivot pin and spring work together to hinge your upper and lower receivers at the front, and without them, your rifle becomes two expensive paperweights. If you prefer a knurled grip surface for faster disassembly, check out the knurled extended takedown pin option. Browse our full selection of safety and takedown components to complete your build or stock your spare parts inventory.
This TacFire pivot pin and detent spring kit fits standard AR-15 and M4 lower receivers that use mil-spec pivot pin geometry. This includes most forged and billet lowers from major manufacturers. It is designed specifically for the front pivot position, not the rear takedown position.
The included AR-15 detent spring measures 26mm in length. This is the standard specification for front pivot pin detent springs and provides proper tension to keep the pin seated during firing while allowing smooth manual operation during field stripping.
Yes, the TacFire MAR087 includes both the front pivot pin and its corresponding detent spring. This gives you everything needed to replace a lost or damaged pivot pin assembly on your AR-15 lower receiver.
No, this kit is designed specifically for the front pivot pin position. The front and rear positions on AR-15 receivers use different pin lengths and spring specifications. You will need a dedicated rear takedown pin kit for that position.
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