TacFire AR-15 Buffer Detent Pin with Spring — USA Made | Reliable Bolt/Buffer Retention for Mil-Spec Lowers (SKU MAR086 | UPC 811261022492)
Small part, big job. The TacFire AR-15 Buffer Detent Pin with Spring is a USA-made, mil-spec component that keeps your buffer and bolt carrier group where they belong during field stripping and daily use. Whether you’re finishing a new lower, refreshing a high-round-count rifle, or stocking an armorer’s bench, MAR086 delivers the correct geometry, spring tension, and durability you need for reliable buffer retention and hassle-free takedown.
Why This Part Matters
Secure retention: Proper detent height and spring rate help capture the buffer behind the retainer—reducing parts launches and simplifying maintenance.
Mil-spec fit: Designed to drop into AR-15 pattern lowers that use a standard buffer retainer and spring (carbine or rifle-length systems).
USA made quality: Built to consistent specs for long service life and repeatable performance.
Perfect for builds & spares: A low-cost, high-value part to have on hand for new builds, refurb kits, and emergency repairs.
Key Features at a Glance
Product: Buffer Detent Pin with Spring
Platform: AR-15 pattern lowers (mil-spec style)
Function: Retains buffer/BCG during takedown; supports smooth reassembly
Construction: Hardened detent with quality steel spring (engineered for long-term elasticity)
Country of Origin: USA Made
Model / SKU: MAR086
UPC: 811261022492
Compatibility: Works with mil-spec lower receivers and carbine or rifle-length buffer systems (A2/A1 or collapsible). Not for proprietary or non-AR platforms.
Fit Tip: Confirm your lower uses a standard buffer retainer pocket. Some specialized or competition lowers omit the retentional feature by design.
Built for Real-World Reliability
Correct spring tension: Helps prevent premature wear or sluggish capture while resisting coil “set” over time.
Hardened detent face: Stands up to repeated contact with the buffer body during routine maintenance.
Smooth takedown: Keeps the buffer in check while you pivot the upper, making cleaning and inspection simpler and cleaner.
Ideal Uses
New lower builds where OEM-spec small parts ensure an easy first assembly
Maintenance refresh for rifles showing weak retention or worn detents
Armorer spare kits—small, inexpensive part that can save a range day or class
Installation Best Practices (Overview)
Unload & clear the firearm; verify chamber and mag well are empty.
Insert the spring into the buffer retainer recess on the lower receiver.
Seat the detent pin on top of the spring and compress carefully.
Thread in the receiver extension (buffer tube) until it captures the detent shoulder—do not overrun the detent.
Verify function: With the tube indexed correctly, press the detent to confirm free movement and buffer retention.
If you’re new to AR assembly, consult a qualified armorer or follow a reputable armorer’s guide. Always adhere to manufacturer torque specs and safe-work practices.
Specifications (Quick Reference)
Detent Material: Hardened steel
Spring Material: Music-wire/quality steel (tension-rated)
Finish: Wear-resistant, smooth operation
System Support: Carbine and Rifle buffer systems (mil-spec)
Includes: 1x buffer detent pin + 1x buffer detent spring
Model: MAR086
UPC: 811261022492
Care & Maintenance
Keep it clean: Wipe carbon and grit from the buffer face and detent area during routine cleaning.
Light lubrication: A tiny drop of oil on the detent/spring can reduce corrosion—avoid over-lubing, which attracts debris.
Inspect annually: Replace if you notice deformation, sluggish movement, or weakened spring tension.
FAQs
Q: Will this work in a .308/AR-10?
A: This part is sized for AR-15 pattern lowers. Many AR-10/.308 receivers use different dimensions—confirm specs before use.
Q: Is the spring included?
A: Yes. MAR086 includes both the buffer detent pin and the detent spring.
Q: Do I need any special tools?
A: Basic punches and a secure vise/armorers block help. Take care to prevent the spring from launching during installation.
Q: Can I reuse my old spring and just swap the detent?
A: You can, but for best results replace both at the same time to ensure proper tension and longevity.
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Meta Title: TacFire AR-15 Buffer Detent Pin with Spring — USA Made | MAR086
Meta Description: Keep your AR-15 reliable with the TacFire Buffer Detent Pin & Spring (USA Made). Mil-spec fit for carbine and rifle buffer systems. SKU MAR086 — UPC 811261022492.
Lock in dependable buffer retention with the TacFire AR-15 Buffer Detent Pin with Spring (MAR086)—a small, USA-made part that makes a big difference in day-to-day reliability.
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