| The ultimate selection for the armorer who wants to build everything. Proudly Made in the USA. |
AR15 Master Parts Kit for Armorers and DIY Builders
The AR15 WLA Master Parts Kit is assembled for builders and armorers who maintain or rebuild AR-platform firearms across multiple projects. Made in the USA, it brings together a broad selection of components to help you finish a build, restock your bench, or service an existing fleet. It suits experienced gunsmiths working through several rifles as well as dedicated DIY builders who want a deep parts supply on hand.
Before purchasing, confirm the included components match your specific platform configuration. As with any AR parts selection, verify fitment against your receiver and existing hardware. If you need a more focused starting point, compare it with the Stage 1 Builder's Essentials Kit or the Stage 5 Complete Lower Parts Kit.
Builders restocking the bench can also browse individual components and small parts in the Uppers & Parts selection to round out specific projects.
Specifications
| Platform | AR-15 / M16 |
| Origin | Made in the USA |
| Storage | Organized, clearly labeled hard case |
| Pivot Pin, M16, black nitride | 10 |
| Takedown Pin, M16, black nitride | 10 |
| Buffer Retainer Pin, M16, black nitride | 10 |
| Detent, Pivot/Takedown Pin, cadmium plated | 50 |
| Detent, Selector, cadmium plated | 20 |
| Detent, Bolt Catch, black nitride | 20 |
| Spring, Pivot/Takedown Detent | 50 |
| Spring, Ejector/Selector | 20 |
| Spring, Bolt Catch Detent | 20 |
| Spring, AR15 Hammer | 10 |
| Spring, AR15 Trigger | 10 |
| Disconnect Spring, AR15 | 20 |
| Spring, Buffer Retainer Pin | 20 |
| Trigger, AR15, 8620, phosphate | 5 |
| Hammer, AR15, 8620, phosphate | 5 |
| Disconnect, AR15, phosphate | 10 |
| Selector, AR15, 8620, phosphate | 5 |
| Bolt Catch, M16, 8620, phosphate | 10 |
| Pin, Fire Control Group, black nitride | 50 |
| Roll Pin, Bolt Catch, phosphate | 25 |
| Roll Pin, Trigger Guard, phosphate | 25 |
| Trigger Guard Assembly, 7075-T6, hard coat black anodized | 5 |
| Magazine Catch Button, 6061, hard coat black anodized | 10 |
| Magazine Catch Assembly, phosphate | 10 |
| Spring, Magazine Catch | 20 |
| Extractor, 5.56, billet, 4140-HT-SP, phosphate | 10 |
| Gas Ring, stainless | 30 |
| Spring, Extractor, standard | 20 |
| Insert, Extractor, rubber | 20 |
| O-Ring, Extractor, Viton | 10 |
| Pin, Firing Pin Retaining Pin, phosphate | 20 |
| Firing Pin, hard chrome plated | 10 |
| Cam Pin, 4140, black nitride | 5 |
| Roll Pin, Gas Tube, phosphate | 50 |
| Roll Pin, Forward Assist, phosphate | 20 |
| Crush Washer, 1/2", 4140, black oxide | 25 |
| Spring, Ejection Port Cover, black oxide | 20 |
| C-Clip, Ejection Port Cover Rod, phosphate | 50 |