MKE AND HK NEW Compatible SB Tactical Folding Armbraces w/FREE SHIPPING! These New USA Aluminum Folding Armbraces from SB TACTICAL Now Replace the Polymer Braces as of 10/16/17. These can be used on any 9mm or 5.56mm Rollerlock firearms. One of them fits the 9mm K and P versions, the other fits all MP5/94/Z5RS 9MM and HK53/93 5.56MM Versions made. Call Chuck anytime for details and to Order.