These barrels have been designed for various guns, tanks and combat vehicles – both contemporary and older (WW2, Cold War). Recently MicroWorldTG has expanded its range of items to 3D-printed products in resin. These include smoke grenade launchers, some barrels, and ammunition. More complex guns are a combination of metal and resin elements.
The great advantage of the MicroWorldTG’s offer is not only a rich and constantly expanding product catalog, but also its ability to design and manufacture a barrel tailored to customer's requirements - just send reference photos and dimensions, and MicroWorldTG will design an appropriate barrel for you.
Check their full range at MicroworldTG website