The United Nations Coding System
There are many confusions as to what the UN codes actually means when looking at them and how to interpret them. You especially have to be aware of this, when you are transporting ammunition to and from a hunting site un public roads. The M2A1-LWAC(R), available for commercial purchase is certified as: UN 4H2/Y18.5/S/18/DK/ETi-18004
| Code | Description |
| UN | The United Nations Coding System |
| 4 | Type of Container: |
| 1 = Drums/Pails | |
| 2 = Barrels | |
| 3 = Jerricans | |
| 4 = Boxes | |
| 5 = Bags | |
| 6 = Composite Packagings | |
| H | Material of Construction: |
| A = Steel | |
| B = Aluminum | |
| C = Wood | |
| D = Fibre | |
| F = Reconstituted wood | |
| G = Fiberboard | |
| H = Plastic | |
| 2 | Category Within Type: |
| 1 = Closedhead | |
| 2 = Openhead | |
| Y | Packaging Group for which container was tested: |
| X = Packaging Group I, II, III (high hazard level) | |
| Y = Packaging Group II and III (medium hazard level) | |
| Z = Packaging Group III (low hazard level) | |
| 18.5 | Gross mass or specific gravity |
| Maximum load / weight in container | |
| S | Solid or hydrostatic test |
| S = Solid | |
| L = Liquids | |
| 18 | Year of manufacturing |
| DK | Country code where manufactured |
| ETi-18804 | Identification of the manufactuer or approval agency |