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. On 7.62 belt fed guns we do not recommend exceeding a 200 round solid string of non stop fire without a cooldown 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. Yea yea yea it’s a little on the heavy side there’s plenty of lightweight less durable options if that’s your thing. But this thing is built to last. – Specs – Length: 6.5 (no mount) – Weight: 20 oz (no mount) – Diameter/OD: 1.75 – Material: Suppressor is DMLS 3D printed & heat treated 718 inconel end caps are machined H900 17-4 stainless steel. – Rear thread pattern: 1.375×24 HUB – What’s included in the box? Suppressor 3 end caps tube clamp end cap wrench.