Stern Defense, Llc Rab-Ad Rapid Attach Buttstock Adapter Male Assembly Black

The Stern Defense RAB-AD Rapid Attach Buttstock Adapter Male Assembly is a quick-detach stock solution designed for AR-platform rifles. If you're looking to swap stocks on the same lower receiver or need a compact setup for storage and transport, this male adapter lets you attach and remove your buttstock or pistol brace in seconds without any permanent modifications to your rifle. The twist-lock mechanism—push the button and rotate 30 degrees counterclockwise to detach, clockwise to reattach—is intuitive and reliable enough for the field or range.

Built from 7075 aluminum with steel internals and hard coat anodizing, the RAB-AD Male is rugged enough for AR-15s running gas piston, direct impingement, direct blowback, or radial delayed blowback systems. At just 2.6 ounces, it adds minimal weight and 1.25 inches to your length of pull. The built-in buffer retainer keeps your buffer weight secure when disassembled, and it plays well with standard-length AR-15 bolts and even JP silent capture springs. One thing to verify: your bolt carrier group's tail must measure 0.950" or smaller—the adapter won't work with BCGs that have a flared boss at the carrier tail.

Everything is designed, machined, and assembled in the USA. The kit includes armorer's tools, and you'll only need a 3/8" ratchet wrench to install it. If you want the flexibility to run multiple stocks on a single lower without permanent changes, this adapter cuts down your overall rifle length for storage and handling while keeping setup quick and bulletproof.

Key Features

• Quick-detach design: attach and remove stocks in seconds with a simple push-and-twist motion
• 7075 aluminum construction with steel internals for strength and durability
• Hard coat anodized finish for wear resistance
• Built-in buffer retainer keeps buffer weight secure during disassembly
• Compatible with standard-length AR-15 bolts and JP silent capture springs
• Compact and lightweight at 2.6 ounces
• Designed for gas piston, direct impingement, direct blowback, and radial delayed blowback AR systems
• Includes armorer's tools; requires only a 3/8" ratchet wrench for installation
• Made in the USA

Specifications

Frequently Asked Questions

Will this work with my AR-15 lower?

The RAB-AD Male is designed for AR-platform rifles using gas piston, direct impingement, direct blowback, or radial delayed blowback systems. The critical compatibility check is your bolt carrier group: the tail of the BCG must measure 0.950" or smaller. If your BCG has a flared boss at the carrier tail, this adapter won't be compatible.

Can I use this with a JP silent capture spring?

Yes, the RAB-AD Male is compatible with JP silent capture springs, as well as all standard-length AR-15 bolts.

What tools do I need to install it?

The adapter comes with armorer's tools included. You'll only need to have a 3/8" ratchet wrench on hand to complete the installation.

How much length does this add to my rifle?

The RAB-AD Male adds 1.25 inches to your length of pull and weighs just 2.6 ounces.