The Fostech Stealth Builder’s Kit (Fostech part no. 10064GR) pairs a matched stripped upper and lower receiver set with a 13-inch Mach-2 handguard rail, all finished in OD Green. Fostech Outdoors matches the upper and lower from the same production run for consistent fit and finish, giving builders a coordinated starting point rather than mixing receivers from different batches. The included Mach-2 rail gives the build M-LOK accessory space right out of the kit. AR-pattern builders who want a matched, OD Green receiver set with rail space already sorted choose this Fostech kit as their starting point.

Key Specifications

• Includes a stripped upper and lower receiver, matched from the same production run.
• Includes a 13-inch Mach-2 handguard rail.
• Finished in OD Green.
• Compatible with 5.56 NATO and .223 Remington upper receiver builds.
• Built as a lightweight foundation for a fast-handling AR build.

Frequently Asked Questions

Are the upper and lower matched? Yes, Fostech matches them from the same production run for consistent fit.

Does this kit include a rail? Yes, a 13-inch Mach-2 handguard rail.

What finish does this kit come in? OD Green.

Buy the Fostech Stealth Builder’s Kit

Start your build with this matched Fostech Outdoors receiver set. Browse more in our rifle parts selection. As a serialized firearm, it ships to your FFL from our Lubbock, Texas gun shop.