The Specwar will work. Quite a few 30 cal rifle cans that will also work. All depends on what features are most important to you in a can; weight, size, dB reduction, QD vs thread on, materials, magnum rated, etc.
It is far more important to be able to hit the target than it is to haggle over who makes a weapon or who pulls a trigger.
— Dwight D. Eisenhower