Midwest Industries Alpha M4 Beam Side Folding Stock Adapter for 1913 Picatinny – Mil-Spec Tube, Black (MI-ALPHA-M4BSF)

• Side folding stock adapter beam for firearms with 1913 stock interface
• Compatible with Mil-Spec diameter AR15 stocks for customizable stock selection
• Heavy-duty side-folding mechanism constructed from 4140 steel for durability
• Full-length locking lug provides solid positive lockup in open and folded positions
• Steel clamp with large surface engagement for secure mounting to 1913 adapter
• Configurable for right or left folding with modular stock attachment design

The Midwest Industries Alpha M4 Beam Side Folder MI-ALPHA-M4BSF is a rifle stock adapter designed for attaching Mil-Spec AR15 stocks to firearms equipped with a 1913 Picatinny stock interface. This beam system fits AK47 platforms and other firearms using a 1913 rail for stock mounting. It is designed as a side-folding stock adapter for modular rear stock configuration in standard setups.

The Midwest Industries Alpha M4 beam side folder features anodized aluminum construction with a black finish and a heavy-duty folding mechanism made from 4140 steel. This model includes a steel clamp with large surface engagement, two QD sling attachment points, and compatibility with Mil-Spec diameter stocks. It can be configured for right or left side folding and uses a full-length locking lug for strength with solid lockup in both positions. In typical setups, the adapter connects to a 1913 interface and is categorized under stocks and buffer tube components for range use or field carry.