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Customer Reviews
Most Recent Reviews Just what I needed by Steve, July 21, 2023
This Adapter was super easy to install and it fits great. I got the Picatinny version and Paired this with the A3 Triangle stock and I now have the most unique looking AP5 at the range. Highly recommend. I might try the 2-bolt version if I were to go...
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Product Info for A3 Industries Rear Stock Adapter for HK MP5/SP5

Manufactured as a Polymer/Aluminum hybrid, our rear adapter provides the OE fit of the polymer adapter with a heavy duty 1/4in thick aluminum insert that supports the recoil spring seat and reinforces the stock mount. Completely unique in design, this adapter provides improved stability by covering more surface area of the receiver. We also include a 1/2in thick high-density polyurethane buffer. The A3 Industries adapter allows the use of our complete line of modular stocks and braces and can also be configured with our Picatinny rail. The Picatinny rail will allow you to adapt any side folding stock (or arm brace) designed for use with Picatinny style mounts.image

The bolt pattern and locating lug on the rear of the adapter provides a positive modular mounting platform for a wide variety of currently available stocks/braces.

Specifications for A3 Industries Rear Stock Adapter for HK MP5/SP5:

Manufacturer: A3 Industries
Color: Black
Gun Make: Heckler & Koch
Gun Model: Heckler & Koch SP5, Heckler & Koch MP5
Gun Type: Submachine Gun (SMG)
Fabric/Material: Polymer
Additional Features: Picatinny

Features of A3 Industries Rear Stock Adapter for HK MP5/SP5

  • Polymer/Aluminum hybrid design
  • OE-fit to receiver with reinforced recoil spring seat
  • 1/2in high-density polyurethane buffer included
  • No modifications to firearm needed
  • Modular design for various cross-platform use
  • Large #10 threads and positive lug for increased mount stability

Package Contents:

  • A3 Industries Rear Stock Adapter for HK MP5/SP5

A3 Industries Rear Stock Adapter for HK MP5/SP5 Orderable Models

List of Orderable Models

USED, A3 Industries Rear Stock Adapter for HK MP5/SP5, Polymer, Picatinny, Black, RSA015 , MPN: RSA015-EDEMO , Code: 69H-STA-MS5RS-RSA015-EDEMO-RE-B
A3 Industries Rear Stock Adapter for HK MP5/SP5, Polymer, Picatinny, Black, RSA015 , MPN: RSA015 , UPC: 810151872087 , Code: 69H-STA-MS5RS-RSA015

A3 Industries Rear Stock Adapter for HK MP5/SP5 Unavailable & Discontinued Models

List of Unorderable Models

A3 Industries Rear Stock Adapter for HK MP5/SP5, Polymer, 2-Bolt, Black, RSA014 , MPN: RSA014 , Code: 69H-STA-MS5RS-RSA014
USED A3 Industries Rear Stock Adapter for HK MP5/SP5, Polymer, Picatinny, Black, RSA015, EDEMO3, Used, Condition Like New, Inspect and Rebox , MPN: RSA015-EDEMO3 , Code: 69H-STA-MS5RS-RSA015-EDEMO-RE-A
USED A3 Industries Rear Stock Adapter for HK MP5/SP5, Polymer, Picatinny, Black, RSA015, EDEMO2, Condition Parts Only/Salvage, Wrong Product , MPN: RSA015-EDEMO2 , Code: 69H-STA-MS5RS-RSA015-EDEMO-WP-F
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