(Yes, 80s-90s era SF’ers, the “5.56 and 7.62” is a Blank Frank Toney reference. For the rest of you, on with the story). Our good friend Guy in a Garage (hereafter Guy) has been up to all kinds of good. You may recall that some time ago he applied to the ATF to manufacture suppressors on ATF Form 1.
He didn’t go about it by half measures. Here’s his 5.56mm suppressor, showing 3D design, computer finite element analysis of the projected flows, and parts machined, mostly, from 7075 round bar stock. The tube is Ti alloy. There’s a large chamber, followed by a blast baffle.
The regular baffles. These are very reminiscent of some baffles Gemtech uses, as discussed below. Here’s the FEA of the baffle, showing the projected pressure drop across it. Noise suppression is all about managing pressure, temperature and time. (Software: Autodesk Flow Design, which is free as in beer).
And here’s similar beauty shots of his .300 Blackout suppressor.
A look in at that type of baffle. That’s not a baffle strike, that’s a feature of the design:
And here are the pair of them, completed and installed:
There are some other Guy in a Garage features there, including a home-made lower and home-made thermal sight. He used a quick-detach system designed by Yankee Hill Machine.
A suppressor (or any muzzle device) made of aluminum alloy, even a strong one like 7075, is going to have durability issues relative to one made of steel or exotic material like cobalt alloys (Inconel) or titanium alloys. But the exotic metals are much harder to machine than steel. This is one reason that selective laser sintering has been cost-effective for prototyping and limited production in such exotics. If you’re limited to subtractive manufacturing, aluminum alloys and steels are much more easily cut.
A word on baffles. We just got to try out a Walther .22 with a Gemtech suppressor that uses a similar style baffle. The suppressor was Hollywood tiny, but with subsonic ammo it was graveyard quiet. In fact, close to Hollywood quiet. (You do know the sounds of “suppressed” firearms in movies are dubbed in in post-processing by the Foley artists, right?) It made our old Hi-Standards sound like a 2″ .44 Magnum by comparison. We didn’t try the pistol with supersonic ammo, but the guy who had the Gemtech (his organization’s, we think, not personal) says it’s still extremely quiet, just not that quiet.
In the Gemtech, the little notch that looks to the novice eye like an artifact of a baffle strike — it isn’t — is turned 90º from the one in the preceding baffle. The Gemtech’s baffles are made of titanium, one reason the suppressor is as light as it is small.
We should have initially included these, in which Guy (username Flood_) answers many questions: Imgur thread and Reddit thread, both from three weeks or so ago. Don’t forget to click the “More comments” button at Reddit.