The American Tactical GSG-MP40 9mm/.22LR 922R Compliant Stock Kit is a purpose-built accessory package for the GSG-MP40 platform, combining a folding steel stock with matched hardware to support a proper 922R configuration. The kit centers on a 12L14 steel folding stock with a folding butt plate and black Parkerized finish, complemented by a steel magazine floor plate, 4140 steel thread protector or muzzle adapter, and an HDPE polyethylene thermoplastic magazine follower. All components are manufactured in the USA for consistent fit and durability.

This stock kit is ideal for owners looking to convert their GSG-MP40P pistol into a compliant rifle configuration or to upgrade an existing setup with robust, Parkerized steel parts. It suits range use, training, and general recreational shooting where a stable, folding stock and reliable magazine components enhance control and handling. As with any configuration change, users must follow all applicable NFA rules and local regulations, while relying on American Tactical’s established reputation for thoughtful design and dependable firearm accessories.

Key Features:

• Manufacturer: American Tactical
• Model: GSG-MP40 9mm/.22LR 922R Compliant Stock Kit
• Type: Stock Kit
• Firearm Fit: GSG MP40
• Material: Steel with HDPE magazine follower
• Finish: Black Parkerized
• Stock Type: Folding steel stock with folding butt plate
• Included Components: Folding stock, magazine floor plate, thread protector/muzzle adapter, magazine follower
• Compliance: Designed to support 922R configuration when installed per manufacturer guidance