5KU M4 Stock Adapter to 1913 Interface Folding Stock Base

Convert M4 Stock to Picatinny Attachment

The 5KU folding stock base adapter enables attaching a Picatinny/interface folding stock to any M4-pattern receiver. CNC-machined aluminum construction offers strength and a drop-in fit when replacing standard M4 stock components.

Key Features

• Material: CNC-machined aluminum with anodized finish
• Enables use of Picatinny-compatible folding stock on M4
• Preserves original buffer tube alignment
• Weight: approx 120 g; compact form factor
• Installation: direct replacement of M4 receiver extension; minor fitting may be required