Work Order 416 Various/Other Modifications

Choose your barrel work, threading and gas system modification options. 1/2 x 28 in. thread is standard. Contact us if you need something custom.

Extended barrel using your supplied muzzle device, usually for 16" OAL builds.

Click or tap the "arrow" for more details

Basic disassembly and reassembly: Required unless you are sending "stripped" parts that do not require disassembly or reassembly.

Laser engraving for your Form 1 tax stamp. Required if you plan to register your gun as a Short Barreled Rifle.

*For unmarked lowers only

Add the "bullet markings" to your unmarked lower or just add the full auto position, if you need it.

This is the machining service required to install the ambidextrous A5/A7/MR223 etc... HK bolt catch/release. Service only, no parts included.

Cross pin notching and correct location installation. Choose your barrel type.

Required to use standard 416 or MR556 barrels in an "indexing tab" style A5/MR223 upper receiver.

For making your semi-auto upper compatible with post sample and transferable machinegun lowers.

Set value package insurance, if you'd like to add it. This is optional. All packages will ship with tracking and signature confirmation regardless.