| The standard, reliable choice for any mil-spec carbine build. Proudly Made in the USA. |
Mil-Spec End Plate and Castle Nut for AR Carbine Builds
This End Plate Kit pairs a mil-spec end plate and castle nut—the hardware used to secure a buffer tube assembly to the lower receiver on a carbine build. It's a common replacement when assembling a new lower or refreshing an existing one, and works alongside a receiver extension, buffer, and buffer spring. Because fitment varies between mil-spec and commercial components, confirm your buffer tube specification before installing. Proudly made in the USA.
Before ordering, verify your buffer tube is mil-spec rather than commercial diameter, have the correct staking or torque tools ready, and check whether your build also needs detent hardware. Builders stocking up can compare the mil-spec end plate five pack or a separate steel castle nut five pack.
For complete assemblies, see our build kits to round out the rest of your lower.
Specifications
| Kit Contents | Mil-spec end plate and castle nut |
| Specification | Mil-Spec dimensions |
| Compatibility | Standard AR10 and AR15 receivers |
| Finish | Phosphate coated |
| Weight | 0.5 ounces |
| Origin | Made in the USA |
Frequently Asked Questions
The kit includes a mil-spec end plate and a castle nut—the hardware used to secure a buffer tube assembly to the lower receiver on a carbine build. It works alongside a receiver extension, buffer, and buffer spring, which are not included in this kit.
It's designed to fit standard AR10 and AR15 receivers with mil-spec dimensions. Because fitment varies between mil-spec and commercial components, confirm your buffer tube is mil-spec rather than commercial diameter before installing to ensure a proper fit.
Yes. Both the end plate and castle nut are made to mil-spec dimensions and are phosphate coated. The kit is proudly made in the USA and weighs 0.5 ounces. It's a common replacement when assembling a new lower or refreshing an existing one.
Installation secures the buffer tube assembly to your lower receiver, so have the correct staking or torque tools ready before you begin. Also check whether your build needs detent hardware. For complete assemblies, see our build kits to round out the rest of your lower.
Yes. Builders stocking up can compare the mil-spec end plate five pack or a separate steel castle nut five pack. Orders ship in 2-3 business days, and free shipping is available on qualifying orders.