Description
Anyone who's fought with a stubborn takedown pin during cleaning knows how much a small detail can matter. CMMG's HD Pivot & Takedown Pin Kit tackles that headache head-on. These are steel pins built slightly longer than the standard mil-spec design, with a small divot machined into the end of each one. That divot lets you place a bullet tip against the pin and push it through cleanly, so your thumb and punch don't slide off at the worst moment.
What Sets the CMMG HD Pin Kit Apart
The extra length gives you a better grip and something to catch when you're opening up the receiver, which is a real help when your hands are cold or the gun is dirty. CMMG machines these to tight tolerances, and the black finish carries a bit more shine than a typical set. Builders have noted they seat up nice and snug on lowers like Aero Precision, so you're not dealing with slop or rattle once they're in place.
Building Out Your AR-15 Lower Receiver
This is one of those pieces that finishes off a lower receiver build, whether you're assembling something from scratch or just want a cleaner, more reliable set than what came in your parts kit. The kit fits standard mil-spec AR-15 lowers chambered in .223 Rem and 5.56 NATO, and it also works fine on .300 Blackout builds since the pin dimensions are the same. It's an easy install with a punch and a little patience for the detent springs.
A Smart Upgrade or Spare
Even if you're not in the middle of a build, this kit makes a great spare to keep in the range bag or on the bench. Small parts like detents and springs have a way of pinging across the room and disappearing, so having a backup set on hand saves a range day. CMMG backs these with their Lifetime Quality Guarantee, which tells you they stand behind the work.
Key Specifications
- Manufacturer: CMMG
- Manufacturer Part Number: 55AFF3B
- UPC: 815835017563
- Caliber/Gauge: .223 Rem / 5.56 NATO
- Compatibility: Mil-spec AR-15 lower receivers
- Material: Steel
- Finish/Color: Matte Black
- Model: AR-15
- Product Type: Pivot & Takedown Pin Kit
- Length: 3.95 in
- Design Feature: Divot end and slightly longer than mil-spec
- Warranty: CMMG Lifetime Quality Guarantee
What’s Included
- 1 Pivot Pin
- 1 Takedown Pin
- 2 Takedown/Pivot Pin Detent Springs
- 2 Takedown/Pivot Pin Detents
Frequently Asked Questions
What makes the CMMG HD pins different from standard mil-spec pins?
These pins are machined slightly longer than the mil-spec design and have a small divot cut into the end of each one. The extra length gives you more to grip during takedown, and the divot lets you use a bullet tip to push the pin out without the punch or your thumb slipping. It's a small change that makes field stripping noticeably easier.
Does the CMMG HD Pivot & Takedown Pin Kit fit my AR-15?
It's built for standard mil-spec AR-15 lower receivers chambered in .223 Rem and 5.56 NATO. Since the pin dimensions are the same, it also works on .300 Blackout builds on the AR-15 platform. Builders have reported a nice tight fit on popular lowers like Aero Precision.
Does this kit come with the springs and detents I need?
Yes. The kit includes the pivot pin, the takedown pin, two detent springs, and two detents, so you have everything needed to finish that portion of your lower. That makes it a complete swap or a handy backup for those tiny parts that tend to disappear during a build.
Is the CMMG pin kit hard to install?
Installation is straightforward if you've done any AR-15 lower assembly before. You'll want a punch and a little patience with the detent springs, since they're under tension and can launch across the room. Taking your time and covering the area with a rag or shop towel keeps everything where it belongs.





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