OSS HX-QD 556 impressions

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July 17, 2021, 09:40 AM
OSS HX-QD 556 impressions
Originally posted by KSGM:
The OSS representative that my LGS spoke to said that the 7.62 cans are getting the flash hider treatment in the very near future.

Nice. I have a Dead Air Wolverine in jail, so I will most likely go with the Titanium, but dang that starting price is high. I could go with any number of suppressors for that price with a more robust mounting system, if low/no back pressure wasn’t necessary.
July 17, 2021, 09:58 AM
Originally posted by KSGM:
Considering the 553 is off the table for now, I installed the OSS on a Sig 516 7" piston gun. Initial impressions are...

Due to stuff in the can left-over from manufacturing, or lubricant in the barrel of that gun, the first few shots were particularly smoky. This allowed me to see all the gas being pushed out through the silencer, which was neat.

I shot a 12-shot drill twice. This particular drill will make my eyes sting with most guns; piston or DI, tuned or not. No sting to speak of with the OSS, so that seems like a win.

I am a baby, and wear ear protection when I shoot with silencers. I shot one round without ears, and it was uncomfortable. Granted this is a can known to be a bit louder, and on a 7" barrel, so I guess that's to be expected.

The mount interface is cool, but maybe leaves something to be desired. It is reverse-thread and seats against a taper on the FH. No redundant latch mechanism. The silencer is "self-tightening", so it shouldn't come off during firing, and I don't think it will. I had read reports of the can being very difficult to remove when hot. I don't care so much about that, and have yet to try it. I waited for it to cool, and it spun right off. What I see as a worrisome aspect is the potential for the silencer to back-off before it is fired and tightens itself. This will require more time with the can, to determine the validity of the concern.

More time will be spent in general, to determine the full range of pros and cons of the HX-QD. Especially once I can get it installed on the gun I intend to use it with.

Thanks for the report. I’ve had one sitting in jail since the end of last year. I bought it specifically for a couple of gassy guns like the Tavor X95 and Beretta ARX-100.
July 17, 2021, 10:02 AM
I was able to hold a HX556 in one hand and a HX556 titanium in the other. I went with the regular one based on stats alone, and I am glad I did. IMO, the weight savings with the titanium in their silencers isn't worth the extra cheese. The difference is evident, but minimal.
July 17, 2021, 10:51 AM
Originally posted by Dwill104:
I bought it specifically for a couple of gassy guns like the Tavor X95 and Beretta ARX-100.

I had an 18" LMT rifle that was the gassiest thing I ever shot with a silencer. I have since sold it. It would have been a great test of the OSS features.

That LMT I had was a DI gun, but I hear you loud and clear on the piston guns. Like I said, I intend to use mine on a 553. Piston guns are not immune to the ill effects of most silencers. That pressure and filth comes back through the bore too.
July 17, 2021, 06:36 PM
Shot the same drill twice again, but with a Sig P556 this time. Results are odd. Recoil impulse seemed a bit rough, and I experienced a bit of gas sting in the last few rounds of each twelve-shot string. I swapped the valve out for one with a .035" port, which is what I use for other silencers, when shooting the 55X. The gun barely ejected and did not pick up another round. So the OSS silencer is certainly doing it's job, but this host was not as pleasant as the 516.

The recoil impulse could be due to the long-stroke vs short-stroke difference between those two guns, though I usually find the 55X to be quite pleasant. No real way to explain the gas sting, but it does serve to reinforce the fact that piston guns are not immune to the negative effects of silencers. It kind of bums me out too, as I really intended to use this silencer on a 553. The P556 isn't quite the same though, so i am holding out hope.