CGS Helios QD will outlast anything currently available on that host.
Here it is on a 5.5" 7.62x39 firing in full auto and semi:
Link 1 and
Link 2And here it is on 10.5" MK18 doing a full auto mag dump:
Link 3
It doesn’t have a minimum barrel length. The Helios QD silencer is pretty much impossible to kill by any conventional method. We’ve fired ~2300rds through one on a MK18, half with full auto 30rd mag dumps and the other half semi auto and then did ten 30rd mags in a row full auto and five 30rd mags in a row full auto as fast as the mags could be changed, all of those ~2300rds being fired over only maybe 3hrs. Then we took it to the NFA Review shoot. We’ve been doing 200rd belts through them with a SAW to the point the barrel droops. Then shot it more when it cooled.
It comes as a kit with a 1/2x28 direct thread mount, a 5/8x24 direct thread mount, a QD adapter which will work with any 1.375x24 Omega pattern mount, a standard front cap, and a vented front cap. The standard front cap allows it to work like a traditional silencer and the vented front cap allows it to work as an "out the front" vented silencer similar to OSS but better. All the joints sit on shallow tapers and since it's DMLS 718 Inconel which is 3D printed, the silencer is perfectly concentric. And like all of our 5.56 silencers it has a 7.62 bore so it helps with backpressure and ear sound and also gives you some margin of error if you have a destabilized bullet out of that short of a barrel.