Being made from DMLS 3D printed & heat treated 718 inconel this thing is tough as nails. No barrel length restrictions no firing schedule restrictions on magazine fed guns. On belt fed 5.56 guns we recommend not exceeding a 300 round solid string of non-stop fire without a cool down period. If you are running it on a belt fed you need to be using the vented end cap. This suppressor has been tested to the most brutal extremes we can think of and has handled anything we’ve thrown at it.