A while ago I purchased the CGS Helios QD because, at the time, it was regarded as the quietest .223/5.56 suppressor for its size. It was also appealing to me because it’s bored out to 30 cal and 300 Blackout is my most shot rifle round so I was thinking that I could use this suppressor with a variety of guns.
Later, I decided that I wanted to invest in the Dead Air Xeno mount and use it for all my AR suppressors. Well, after some research, I found out that because of the narrow blast chamber between the hub threads of the Helios and its first baffle, you’re kind of limited to a handful of mounts and its muzzle devices if you want to directly attach the mount to the back of the Helios. With longer muzzle devices, the tip of the muzzle device will hit the first baffle and things won’t screw on properly. Unfortunately, the Xeno system would not be compatible.
There is a workaround for this and that is to use the adapter that came with the Helios which is essentially an extension tube that just increases clearance. This absolutely works and allows you to use just about any mount and muzzle device but to me, this is ugly and takes away from a pretty good-looking suppressor. Not to mention that it adds over an inch to the overall length and would defeat the purpose of buying this small suppressor to me.
Again, the Xeno system was not going to work with the Helios QD without modification, that is if you were planning to use the Xeno brake or flash hider. However, Dead Air does make the Xeno Xero, which is essentially just the threads with no added benefit. This is as short and minimal as you can get with the Xeno system and in theory, it should work with the Helios. I was tired of wondering and bought the Xeno Xero for myself and I’m happy to report that this combination does work. You can mount the Xeno adapter directly to the Helios QD and make it run with the Xeno Xero muzzle device.
I should mention that Dead Air now also offers the Xeno Pistol Wee Brake. This is just a super short muzzle brake that should fit those suppressors with smaller blast chambers like the Helios QD. I would’ve bought this to try but recently, Dead Air added the word “Pistol” to the Wee Brake name and changed the marketing to specifically mention 9mm sub-guns so I don’t know if this brake is rated for rifle rounds even though it’s bore size is large enough to accommodate some. I’ll have to contact Dead Air about this and if it’s good to go, I’ll order a couple for my 300 Blackout builds so that I can use them with the Helios.
But for now, if you want to run the CGS Helios QD with the Dead Air Xeno system directly mounted with no extension tube, you at least know that it’ll work with the Xeno Xero muzzle device.
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