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Buffer Kits
AR Buffer Kits and End Plate Hardware for Your Build
Buffer kits provide the receiver extension hardware needed to assemble and secure an AR-15 or AR-10 stock assembly. This category focuses on end plate kits, each pairing an end plate with a castle nut to lock the receiver extension in place. Choose from the Ambidextrous Dual Loop for left- or right-side sling routing, the Mil-Spec End Plate for common builds, or the Quick Detach Steel option with a QD provision for compatible sling mounts.
These American-made, mil-spec components support straightforward installation for first-time builders and experienced gunsmiths alike. Pair them with buffer parts like buffers and retainer springs, or complete the receiver with our lower kits.
Confirm the kit matches your receiver extension and intended sling setup before ordering. For broader assembly needs, see our build kits. White Label Armory also supports white-label manufacturing partnerships for firearms companies sourcing AR components.
What this category includes
- End plate and castle nut kits for AR-10 and AR-15 lowers
- Mil-spec, ambidextrous dual loop, and quick detach (QD) configurations
- Phosphate coated finish across all options
- Steel end plate available on the QD version
- Support for single or two point sling setups
- Fits all standard AR10 and AR15 receivers
- Lightweight hardware, roughly 0.5-0.6 ounces
- Consider sling attachment needs and proper castle nut torque/staking
Frequently Asked Questions
Each kit pairs an end plate with a castle nut, the hardware used to lock your receiver extension in place during an AR-15 or AR-10 build. Options include a Mil Spec end plate and castle nut, an Ambidextrous Dual Loop version, and a Quick Detach Steel version with castle nut.
The Mil Spec End Plate and Castle Nut kit is described as mil-spec. All kits are American-made AR components designed to secure the receiver extension. For the Ambidextrous Dual Loop and Quick Detach Steel options, confirm the fit against your build's spec before ordering.
The Ambidextrous Dual Loop end plate provides sling loops on both sides, while the Quick Detach Steel end plate is built to accept a QD sling swivel. The Mil Spec option is a standard end plate. Each ships with a castle nut to lock the receiver extension.
An end plate kit covers the end plate and castle nut only. For the receiver extension, buffer, and spring, see our Buffer Parts selection to source the remaining components for your build.
These end plate kits are listed for AR-15 and AR-10 platform builds, securing the receiver extension on the lower. Compatibility depends on your receiver extension and hardware, so confirm the components match your build's spec before installation.
White Label Armory ships orders in 2-3 business days. Free shipping is available on qualifying orders. Once your end plate kit ships, you'll be able to complete the receiver extension portion of your AR build.
Build on.
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