Ammo box 5.56, 5.56×45mm NATO + SIG 550 Strip

Stackable Ammobox for 5.56 and a speed loader for sig 550 / STGW90

this is a heavy remix of: 223 rem Ammo box

v2: sligtli optimized to use less support 

Check out my handle to carry 3 or more ammo boxes at once: https://www.printables.com/model/672973-holder-with-handle-for-ammo-box-556-556x45mm-nato