Probably the best value in rifle cans right now.
Here is the thing about NFA... It's not cheap, don't be cheap, you'll pay now or you'll pay later, either in the can or mounts or whatever, it'll cost you, these are LIFETIME purchases, remember that. That said there are good deals and the Specwar is one.
Here is the other thing about rifle cans... They all sound about the fucking same. So on that note, when you buy a rifle can you are buying first and foremost a mounting system. Buy a heavy or loose mounting system or a questionable one (most, but specifically YHM, AAC, and others) and you're setting yourself up for dissapointment. Either that the mount is hard to install, hard to remove (carbon locks), is perpetually loose meaning worse accuracy, doesn't have a good range of flash or brake options, etc etc.
Right now, the rifle ONLY can's I'd even come close to recommending are:
Specwar
+ Great lockup
+ Inexpensive
- Heavier
- External teeth on mount
Saker
+ Modular (fine for 97% of use)
+ Great Lockup
- No 762 option yet
Sufire Socom series
+ Great Lockup
+ Newest military orders/usage
- Price
If you can stand a little extra weight, the Specwar is a great option for 556 to 300 magnum. Has a very good mounting system which means EVERY mount will lock up tight as it should no need to modify or deal with tolerances. Has brake and flash hider options. And is comparatively inexpensive, even to worse options (762SDN6). It's also from SWR/Silencerco which has a great rep for service, very much unlike some others