The Midwest Industries Alpha Series M4 Beam is a fixed stock adapter designed for connection to a 1913-style interface. It fits 1913-style rails and is listed for M4 rifles, with compatibility for milspec-diameter stocks. The construction combines aluminum, polymer, and rubber.

Key Specifications

• The stock adapter uses a fixed Picatinny interface.
• It fits 1913-style rails for installation on compatible platforms.
• The adapter is compatible with milspec-diameter stocks.
• It adds 6.5 inches to the overall length of the firearm.
• The listed weight is 5.5 ounces.
• Construction includes aluminum, polymer, and rubber.
• The listed dimensions are 2.30 × 2.35 × 10.00 inches.
• The listed height is 2.3000 inches.
• The listed width is 2.3500 inches.
• The listed length is 10 inches.

With its fixed design, 1913-style interface, and compatibility with milspec-diameter stocks, the Alpha Series M4 Beam provides a clearly defined foundation for a compatible stock setup. Its compact beam design and mixed-material construction make it a practical component for users who value straightforward fitment and documented specifications.