The AR-15/M16 Take Down Pin – Part # TAKEDOWNPIN is a simple but critical small part that keeps your upper and lower receivers securely locked together while still allowing fast, tool-free field stripping. Whether you’re building a new rifle, refreshing a worn duty gun, or setting up a spare parts kit, a high-quality AR-15 takedown pin is essential for maintaining reliability and ease of maintenance on any AR-15, M4, or M16-pattern platform.
Built to mil-spec dimensions and designed as a drop-in replacement, this takedown pin restores that tight, positive lockup you expect from a properly assembled rifle—without unnecessary play or frustrating fit issues.
Secure Lockup for AR-15 & M16 Platforms
The AR-15/M16 Take Down Pin (TAKEDOWNPIN) is engineered to keep your upper and lower receivers firmly joined while still allowing you to quickly separate them for cleaning or inspection.
Key benefits:
Positive, consistent lockup between upper and lower receivers
Helps minimize excess wobble and play, contributing to a more solid, uniform feel
Works with a wide range of AR-15, M4, and M16-style lower receivers built to standard dimensions
Ideal for replacing worn or damaged factory pins that no longer hold as firmly as they should
Whether you’re running a range gun, patrol rifle, competition carbine, or training build, a reliable takedown pin is essential to the heart of the AR platform.
Mil-Spec Dimensions – Drop-In Replacement
This AR-15/M16 take down pin follows standard rifle-pattern specifications, making it highly compatible with most mil-spec and mil-spec style receivers.
Typical mil-spec style features include:
Standard diameter for AR-15/M16 rear takedown pin holes
Correct overall length to fully engage both receiver lugs without binding
Profiled head and groove designed to work seamlessly with a standard takedown detent and spring
Drop-in installation on most AR lowers with no permanent modifications required
Whether you’re completing a stripped lower or servicing a rifle that has seen thousands of rounds, this pin is designed to slide into place and work as expected.
Durable Steel Construction for Long Service Life
The takedown pin is typically constructed from hardened steel, specifically chosen to withstand repeated cycling, field stripping, and everyday use.
Why steel matters on a small part like this:
Resists bending and deformation during routine use and disassembly
Holds up against wear from the takedown detent engaging its groove
Helps maintain crisp, positive engagement over time, instead of becoming sloppy or loose
Offers a long service life, even in rifles that see regular training, practice, and cleaning
Paired with a quality detent and spring, this pin helps ensure your receivers remain firmly together until you intentionally separate them.
Smooth, User-Friendly Design
The AR-15/M16 Take Down Pin TAKEDOWNPIN is designed with everyday practicality in mind:
Rounded head profile makes it easy to push from side to side with finger pressure or a non-marring tool
Precision-cut groove ensures the takedown detent locks the pin into place firmly—no unintentional walking out
Smooth surfaces and proper tolerances help the pin move easily without binding, even in tight-fitting receivers
The result is a pin that stays put when it should, but still lets you pop open the rifle quickly for cleaning or inspection when needed.
Perfect for Builds, Repairs & Spare Parts Kits
Because of its importance and small size, a spare AR-15 takedown pin is one of the smartest, most affordable insurance pieces you can keep on hand.
This pin is an excellent choice if you:
Are building a new AR-15 or M16-style rifle from a stripped lower
Need to replace a lost, damaged, or out-of-spec pin
Want to assemble a spare parts kit for range or field use
Maintain a fleet of rifles and want consistent, standard small parts across multiple guns
Keeping a quality takedown pin on hand means you won’t be sidelined by a missing or worn component that’s absolutely essential to a functioning rifle.
Clean, Professional Look for Any Build
Even small details matter on a clean build. This takedown pin is designed to blend seamlessly with most modern ARs:
Low-profile, classic design complements both duty-style and minimalist builds
Works well with black, FDE, OD green, and other popular receiver finishes
Keeps your rifle looking complete and professional, rather than mismatched or cobbled together
Whether you’re going for a classic duty carbine look or a custom modern rifle, this pin fits right in aesthetically and functionally.
Easy Installation with Standard AR-15 Components
Installing the AR-15/M16 Take Down Pin TAKEDOWNPIN is straightforward when used with standard takedown detent and spring components.
At a high level (always follow manufacturer instructions and safe handling practices):
Insert the takedown detent and spring into the appropriate channel of the lower receiver
Align the upper and lower receiver lugs
Slide the takedown pin through the lugs, allowing the detent to engage the groove and lock the pin into place
If you’re new to AR-15 assembly or unsure of any step, it’s wise to consult a reputable armorer’s guide or a qualified gunsmith for assistance.
Key Features – AR-15/M16 Take Down Pin TAKEDOWNPIN
Product Type: AR-15 / M16 rear takedown pin
Part Number: TAKEDOWNPIN
Platform Compatibility: AR-15, M4, M16-style rifles with standard mil-spec pattern lowers
Construction: Hardened steel (typical for durability and longevity)
Function: Secures upper and lower receivers together while allowing quick separation for cleaning and maintenance
Design:
Standard head for easy push/pull operation
Precision groove for detent engagement
Mil-spec style dimensions for drop-in fit on most builds
Use Case:
New builds and lower receiver assemblies
Replacement for worn, damaged, or missing factory pins
Spare part for range, field, or armorer kits
If you’re looking for a reliable, mil-spec style AR-15 takedown pin to complete a build, replace a worn part, or stock your spare parts kit, the AR-15/M16 Take Down Pin TAKEDOWNPIN delivers the secure lockup, smooth operation, and durable steel construction that modern AR shooters expect from their small parts.
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