JMac Customs


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Current Stock:
4.00 Ounces
Folding M4 Adapter
Buffer Tube
Castle Nut

Finally a way to mount 1913 stocks/braces to your favorite full size MP5 clone!

This adapter will fit the Standard/Full Size MP5 as well as HK33 (556). It has a picatiny rail machined on the rear which allows you to install 1913 style stocks/braces!  

Cheek wield is adjustable using any stock/brace by simply attaching the stock/brace higher or lower on the picatiny rail!


  • 7075 Aluminum
  • Hardcoat Anodized
  • Includes a replaceable recoil buffer
  • No permanent modifications required
  • Simple installation*


*This adapter is designed to fit super tight and installation will most likely require a rubber mallet to drive in place.

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