Click to see full view
CMMG
Overview
The CMMG AR-15 HD Pivot and Takedown Pin Parts Kit is designed to provide a reliable and sturdy solution for securing your AR-15 upper and lower receivers. Made from steel, this pin set is essential for maintaining the structural integrity of your firearm during assembly and disassembly. This kit is frequently found in builds utilizing a mid-length gas system chambered in 5.56 NATO, making it a solid choice for those configurations.
CMMG AR-15 HD Pivot and Takedown Pin Parts KIT - 55AFF3B was the most added takedown pin on GunPartPicker in August 2026, ahead of the Strike Industries AR-15 Ultra Light Pivot / Takedown Pins - FDE, with about 32% of all takedown pins added to builds. That's its 4th straight month at #1. Builds with this takedown pin are mostly chambered in 5.56 NATO (68%, then .223 Wylde 14%), split between mid-length (48%) and carbine-length (31%) gas systems, and mostly AR-15 (76%, then AR-10 20%).
Availability is good: it was in stock at one retailer or another nearly every day in August 2026, and today 11 of the 12 retailers we track have it in stock. It dipped to $16.38 at KY Gun Company for a stretch in August 2026, under its usual $16.95 to $17.99, so sales do come around. Buying today, the lowest price is $16.38 at KY Gun Company, which matches the best price we saw in August.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 31 retailers
We ranked every takedown pin by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Takedown Pin Guide →The part most often added in each category by the 1,726 builds that include this one
Aero Precision Stripped M4E1 AR-15 Lower Receiver - Special Edition - Freedom
Strike Industries Ambidextrous Magazine Release, Black - ARAMBIMRBK
Geissele Automatics AR-15 SSA-E X Lightning Bow Trigger
Timber Creek Outdoors Ambidextrous Safety Selector - Black
Wilson Combat AR-15 Starburst Gunfighter Pistol Grip Black
Strike Industries Extended Bolt Catch
Aggregated and anonymized data showing how builders use this product
Builds in the community that include the CMMG AR-15 HD Pivot and Takedown Pin Parts Kit - 55AFF3B
| Build | Parts | Total |
|---|---|---|
 | 23 | $2733.07 |
 | 22 | $876.02 |
 | 22 | $1378.55 |
 | 21 | $692.25 |
 | 23 | $4026.81 |
 | 22 | $868.00 |
 | 18 | $1205.86 |
 | 17 | $2551.54 |
 | 17 | $744.56 |
 | 22 | $2266.75 |
 | 17 | $798.40 |
 | 28 | $3665.40 |
8 global ratings
Top reviews
CMMG HD pin kit is the full assembly with springs, detents, and the upgraded pin heads. The HD profile is heavier than milspec but the takedown feels positive. Phosphate finish across steel parts. Easier than piecing together a milspec pin set from different sources.
heavy duty pivot and takedown pin kit, the pins are slightly larger diameter than mil spec which removes any rock between upper and lower. install was direct after a light chamfer pass with a reamer. premium upgrade for builds with sloppy pin holes
CMMG HD pin kit anodize matches my CMMG receiver well. HD profile is heavier than mil-spec but the takedown feels positive. Spring tensions are correct on the supplied detents. Phosphate finish on the steel parts is consistent.
CMMGs HD pin kit includes the pins, springs, detents, and the small parts needed for a complete lower build. The HD pins themselves have a slightly larger head profile which makes takedown easier. Phosphate finish across all the steel parts. Saves piecing things together.
good upgrade but the finish has a slight color variation from the other parts in my build
CMMG heavy duty pin set fixes loose pin holes on cheaper lowers. slightly oversize fit means no rock between halves. detent engagement is positive. one of the best small upgrades for any sloppy build
CMMG includes the springs and detents along with the pins which is convenient. HD profile is heavier than standard but the takedown action feels positive. Phosphate finish on the steel parts is consistent. Easy install on an unbuilt lower. Saves time vs sourcing parts individually.
CMMG HD pin kit drops into a milspec lower with the included springs and detents. HD profile heads are easier to grip than standard mil spec. Phosphate finish on the steel parts. Saves piecing together small parts individually.
