Midwest Industries AR-15 Buffer Tube Adapter - 1913 Picatinny Rail, Aluminum, Black

If you're building or upgrading a rifle platform that uses a Picatinny rail but want the ergonomic comfort and modularity of an AR-15 collapsible buttstock, the Midwest Industries AR-15 Buffer Tube Adapter is your bridge piece. This aluminum adapter lets you mount a standard AR-pattern stock to non-AR platforms equipped with 1913 rail systems, giving you a familiar shooting experience without a custom build.

The adapter features six adjustable positions for length of pull, so you can dial in the fit for your body, gear, and shooting style. Unlike a traditional buffer tube, this is a stock-mounting interface only—it's not designed to function as a buffer system. What sets it apart is the sealed internal storage compartment built into the hollow tube. That water-resistant cavity is perfect for stashing batteries for an optic, small spring kits, cleaning patches, or any other compact gear you want protected and accessible.

Built from 6061 aluminum with hard coat anodizing, it's engineered to handle field use while keeping weight down. The design is clean and compact, and installation is straightforward. Made in the USA, Midwest Industries focused on the details that matter: durability, functionality, and fit.

Key Features

• Mounts AR-15 collapsible stocks to Picatinny rail-equipped rifle platforms
• Six-position adjustable length of pull for proper fit
• Water-resistant internal storage compartment for small parts and batteries
• 6061 aluminum construction with hard coat anodize finish
• Mil-spec diameter tube for compatibility with standard AR stocks
• Compact, clean profile design
• Made in the USA

Specifications

Frequently Asked Questions

What stocks will fit this Midwest Industries adapter?

Any standard AR-15 collapsible buttstock designed for mil-spec diameter tubes will work with this adapter. The tube diameter matches mil-spec dimensions used on AR-pattern rifles.

Can I use this as a buffer tube on an AR platform?

No. This adapter is designed solely to mount an AR stock to a Picatinny rail interface on alternative rifle platforms. It does not function as a buffer tube and is not rated for that purpose.

What's the water-resistant storage compartment for?

The hollow interior compartment is sealed and water-resistant, making it ideal for storing small items like CR123 or AA batteries for mounted optics, spare springs, cleaning patches, or other compact field gear you want kept dry and accessible.

How is length of pull adjusted?

The adapter offers six different positions for length of pull, allowing you to customize the buttstock distance to match your body size, shooting posture, and gear configuration.