Dan Haga Designs
JMac Customs' 1913 Stock/Brace adapter for the MP5
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!