Home / Build Your Own / MP5 40/10 Bolt Hold Open Weldment Tubes MP5 40/10 Bolt Hold Open Weldment Tubes$19900 Categories: Build Your Own, hide-from-search, Work Orders Product ID: 5677 Custom, hand made weldment set. Required for MP5 40 Cal and 10mm builds with cut up or missing tubes. MP5 40/10 Bolt Hold Open Weldment Tubes quantity Add to cart Description Description Custom, hand made weldment set. Required for MP5 40 Cal and 10mm builds with cut up or missing tubes. You may also like… Out of stock HK MP5 A3 Factory Collapsible Stock $89900 Out of stock HK MP5 Ambidextrous/Ambi 3 position 0 1 3 Burst Only Lower Group from: $54900 Out of stock B&T Type HK MP5 Removable Top Rail $6900 Related products Sale! HK UMP 10mm Conversion Kit Bolt and Barrel from: $69900$49900