I am running an Omega 300 on a .223 bolt gun. With a direct thread mount and 5.56 end cap, the Omega is 6" long and 14 ounces. A couple of additional ounces can be shaved with a titanium direct thread mount and titanium end cap. I don't have a sound meter, but very effective at reducing muzzle report. Fairly compact and light, compared to most. I use that suppressor on all of my centerfire rifles. Rated to .300 Win, direct thread mounts and end caps are available for most calibers. An ASR mount adds almost an inch and some weight, as does the break that replaces the end cap. Lots of options.