AR-15 Takedown Pin Detent Spring
The United Defense AR-15 Takedown Pin Detent Spring is a MIL-SPEC replacement spring for the rear takedown pin on any standard AR-15 or M4 lower receiver. Wound from hardened spring steel with a corrosion-resistant finish, it delivers the consistent tension needed to keep the takedown pin detent properly seated and the rear pin captured during operation. This is one of the most frequently lost small parts during a lower build or detail cleaning, making it an essential spare for builders, armorers, and anyone running an AR platform. Pick up a few for your spares kit, range bag, or workbench.
In stock
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- SKU
- 8448586-1
$1.95
Description
Features
- MIL-SPEC Dimensions — Wound to standard AR-15/M4 specifications for a true drop-in fit in any mil-spec lower receiver.
- Hardened Spring Steel — Manufactured from high-tensile spring steel for consistent tension and long service life.
- Corrosion-Resistant Finish — Protective coating helps resist rust and wear from solvents, oils, and field exposure.
- Positive Detent Engagement — Maintains firm pressure on the takedown pin detent to keep the rear pin captured during operation.
- Smooth Takedown Function — Calibrated tension allows the rear pin to push and pull cleanly without binding or excessive resistance.
- Essential Build/Repair Part — One of the most commonly lost small parts during a lower build or detail strip — a must-have for any AR-15 spares kit.
- Universal Platform Compatibility — Works with AR-15, M4, and .223/5.56 mil-spec lower receivers from all major manufacturers.
- Compact Spare — Small footprint makes it easy to stash multiples in a range bag, armorer's kit, or build box.
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Customer Reviews
Top customer reviews
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Essential small part for AR-15 assembly.I was finishing a lower build and needed this part. It arrived the next day and worked perfectly.
Affordable and brand new;
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SatisfiedI was putting together my AR-15 and needed this small part to work. It fit perfectly without any problems during the build. The new spring feels much stronger than the old one I took out. Since I installed it, the rifle goes together smoothly. It is a simple fix that makes a big difference in how my gun functions. I would buy this again for any project where I am building a rifle.
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