| Optimized parts kit designed for the specific needs of pistol caliber carbines. Proudly Made in the USA. |
AR15 Pistol Caliber Lower Parts Kit With Phosphate Finish
This lower parts kit is built for pistol caliber carbine (PCC) builds that run on blowback operation rather than a traditional gas system. Because blowback platforms generate increased vibration and force, the kit uses hardened components designed to hold up under those conditions and help keep your carbine running reliably. The phosphate finish is a common choice among builders wanting a durable, mil-spec-style coating on internal small parts.
It is a practical option for assembling a dedicated PCC lower or refreshing the internals on an existing one. As with any build, confirm the kit's components match your specific receiver and configuration before installation. For standard rifle builds, compare the Stage 5 Complete Lower Parts Kit or browse the full Lower Kits selection.
Need to round out the rest of your build? Explore matching Trigger Parts to complete the fire control group.
Specifications
| Platform | AR15 Pistol Caliber Carbine (PCC) |
| Operating System | Blowback |
| Finish | Phosphate |
| Fitment | Mil-Spec dimension lower receiver |
| Origin | Made in the USA |
| Hammer | Included |
| Trigger | Included |
| Disconnect | Included |
| Bolt Catch | Included |
| Bolt Catch Detent | Included |
| Selector | Included |
| Selector Detent | Included |
| Fire Control Group Pins | 2 |
| Takedown Pin | Included |
| Pivot Pin | Included |
| Takedown/Pivot Pin Detents | 2 |
| Buffer Retainer Pin | Included |
| Spring Kit | Complete |
| Pistol Grip | A2 Grip Assembly |
| Not Included | Trigger guard, magazine catch |
| Construction | No polymer or MIM parts; no foreign-made components |
Frequently Asked Questions
The kit includes a hammer, trigger, disconnect, two fire control group pins, bolt catch with detent, selector with detent, takedown pin, pivot pin, two takedown/pivot pin detents, buffer retainer pin, and a complete spring kit. It's a complete kit built for pistol caliber carbine lower assembly.
Yes. It's designed specifically for AR15 pistol caliber carbine (PCC) builds running blowback operation rather than a traditional gas system. The hardened components are made to withstand the increased vibration and force common to non-gas-operated platforms and help keep the carbine running reliably.
The kit is designed for mil-spec dimension lower receivers. As with any build, confirm the kit's components match your specific receiver and configuration before installation. If you have questions about fitment, reach out through the Contact Us page.
The internal small parts have a phosphate finish, a common durable, mil-spec-style coating chosen by many builders. All components in the kit are made in the USA.
This kit covers the lower's internal small parts. To complete the fire control group, browse Trigger Parts, and check Lower Controls for grips and related parts. Orders ship in 2-3 business days, with free shipping available on qualifying orders.