The CMMG Detent, Fits Receiver Pivot/Takedown on AR-15, Silver, 10 Pack (55AFF51, UPC 815835019734) is a must-have small parts pack for any AR-15 owner, armorer, or builder who wants to keep their rifles running smoothly. These precision detents are designed specifically for the pivot and takedown pins on AR-15 receivers, ensuring positive retention of your upper and lower while still allowing fast field stripping and routine maintenance. Brownells+3Rifle Supply+3RRTacticalDesign+3
Whether you’re finishing a new build, refreshing a trusted workhorse, or putting together a serious spare-parts kit, this CMMG 10-pack gives you the high-quality detents you need at the bench, at home, and at the range. GunMag Warehouse+1
Purpose-Built Detents for AR-15 Pivot & Takedown Pins
These tiny components play a big role in your rifle’s reliability. The CMMG receiver pivot/takedown detents are engineered to interface with standard AR-15 pivot and takedown pins, locking into the grooves on the pins to keep them from walking out under recoil or rough handling. Brownells+3Palmetto State Armory+3Ammunetix™️+3
Key functional benefits:
Secures pivot and takedown pins so your upper and lower receivers stay firmly joined in use
Maintains positive, repeatable pin tension, giving your rifle that solid, quality feel
Designed to work with mil-spec AR-15 receivers and pins, so they’ll drop into most standard builds CMMG - AR 15 and AR 10 Builds and Parts+2OpticsPlanet+2
If you’ve ever had a detent launch across the room during disassembly, you already know why it’s smart to keep extras on hand.
10-Pack Value – Ideal for Builders & Spare Parts Kits
The 55AFF51 configuration packages these detents in a convenient 10-pack, giving you enough parts to support multiple rifles or to stock a robust spares kit. Taktactical.com+2Brownells+2
Why a 10-pack just makes sense:
Perfect for AR-15 builders who assemble multiple lowers or help friends with builds
Ensures you’re covered when a detent inevitably goes flying during a pivot/takedown pin install
Great for armorers, instructors, and range staff who maintain a fleet of rifles
Keeps your field/bench repair kit ready so a missing detent never sidelines a gun
At this price point, it’s cheap insurance against one of the most common “lost parts” headaches in the AR world.
Silver Finish & Precision Construction
These CMMG detents come in a silver finish, matching what you’ll see in most quality AR-15 internals and making them easy to visually identify in a parts tray. Retailers describe them specifically as “Detent, Fits Receiver Pivot/Takedown on AR-15, Silver”, confirming both fit and color. RRTacticalDesign+3Palmetto State Armory+3Performance Triggers+3
Construction highlights:
Precision-machined detent profile with a pointed end for smooth engagement into pin grooves and a flat end for proper spring seating Ammunetix™️
Built from durable, heat-treated steel (per pivot/takedown detent spec) for long service life under repeated use Ammunetix™️+1
Sized to work with standard AR-15 lower receivers and correctly dimensioned detent springs
The result is a small part that does exactly what it’s supposed to do—every time you push a pin in or out.
Compatible with Mil-Spec AR-15 Receivers & Pins
This CMMG detent pack is advertised as compatible with mil-spec pivot/takedown pins and AR-15 receivers, making it a straightforward fit for most standard-pattern rifles and carbines. GunMag Warehouse+2RRTacticalDesign+2
Typical compatibility includes:
AR-15 lowers built to mil-spec dimensions
Standard pivot and rear takedown pins used on common AR-15 platforms
CMMG’s own AR-15 (Mk4) rifles and many other respected brands CMMG - AR 15 and AR 10 Builds and Parts+1
As always, it’s good practice to confirm your rifle uses standard-size pins and detents, especially if you’re working with unusual or proprietary receivers.
Built to Withstand Harsh Use & Real-World Conditions
CMMG parts are known for durability, and this AR-15 receiver detent 10-pack is no exception. The detents are manufactured to stand up to: GunMag Warehouse+3OpticsPlanet+3Ammunetix™️+3
Rigorous training cycles
Frequent disassembly and cleaning
Harsh environments, from dusty outdoor ranges to wet field conditions
Several retailers highlight that these parts are built to withstand “the harshest conditions and rigorous use,” backing up their role in keeping your rifle’s upper and lower firmly together in all kinds of lawful use cases. OpticsPlanet+1
Made in the USA & Backed by CMMG
Listings for this 10-pack note that these pivot/takedown detents are Made in the USA and backed by CMMG’s Lifetime Guarantee, demonstrating the company’s confidence in their small parts just as much as in their complete rifles. GunMag Warehouse+2Taktactical.com+2
That means you’re not just getting generic detents—you’re getting OEM-grade components from a leading AR-15 and AR-10 manufacturer with a strong reputation in the industry. Rifle Supply+2Palmetto State Armory+2
Ideal for Builds, Repairs & Preventive Maintenance
The CMMG Detent 10-Pack (55AFF51) is a smart buy if you:
Build or upgrade multiple AR-15 lowers
Need to replace worn, bent, or lost detents in your existing rifles
Want a reliable stash of critical small parts in your range bag, truck kit, or armorer’s toolbox
Maintain rifles for a department, club, or training group where uptime matters
A single missing detent can take a rifle out of action. This affordable pack helps ensure you’re always ready to fix that problem in minutes instead of days.
Installation Note: Installing pivot and takedown detents requires care—these tiny parts are spring-loaded and easy to launch. Always follow your rifle manufacturer’s instructions and safe handling practices, and consult a qualified gunsmith or armorer if you’re not comfortable working with AR-15 small parts.
Key Features & Specifications – CMMG Detent 55AFF51 (10 Pack)
If you’re serious about keeping your AR-15 reliable and ready, the CMMG Detent, Fits Receiver Pivot/Takedown on AR-15, Silver, 10 Pack (55AFF51 / 815835019734) is an essential small-parts upgrade—giving you high-quality, American-made detents for builds, repairs, and long-term preventive maintenance.
The End
