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Fletcher Rifle Works built the Glasspack to solve a simple problem: give AR-15 owners a flash hider that also works as a real suppressor mount, not just a placeholder until you buy a dedicated brake. This version is cut for 1/2×28 threading, which covers the vast majority of 5.56 and .223 barrels out there, and it wears a Sig taper shoulder so it lines up with the mounting geometry Sig Sauer popularized on its Taper-Lok cans. The whole piece is machined from 17-4 PH stainless and heat treated to the H900 condition, which is the same general approach a lot of higher end suppressor components use when they need strength without adding a ton of bulk.
The taper shoulder on this hider isn't just cosmetic. It's designed to self-center your suppressor every time you thread it on, which cuts down on the point of impact shift some flash hiders introduce when a can gets removed and reinstalled. Because it follows the Sig taper geometry, it also plays well with Plan B and Q Cherry Bomb style QD adapter systems, so if you're already running one of those mounting ecosystems on another rifle, this hider slots right into that same setup instead of forcing you into a whole new mounting standard.
17-4 PH stainless in the H900 heat treat is a good match for a piece that's going to see repeated heat cycling from suppressed fire. It resists the kind of galling and thread wear that softer metals can develop after a few hundred rounds behind a can, and it holds up to carbon buildup better than mild steel without needing a heavy coating to survive.
Fletcher Rifle Works runs its shop out of Texas and has built a reputation on tight CNC tolerances, first with its 10/22 receiver work and now across a growing lineup of suppressors and muzzle devices. The Glasspack carries that same attention to fit and finish, so it threads on clean and locks up solid without any extra fitting on your end.
The Sig taper shoulder is machined to self-center whatever suppressor mount you run on top of it, which helps keep your point of impact consistent when you take a can off and put it back on. A standard 90 degree shoulder flash hider doesn't have that same self-aligning feature, so the taper design gives you a more repeatable mount for suppressed shooting.
Since it follows Sig taper geometry, it's built to play nicely with Plan B and Q Cherry Bomb style QD adapter systems that already use that same taper standard. If you're running a different mounting ecosystem, it's worth checking that your adapter is compatible with a Sig taper shoulder before ordering.
17-4 PH stainless heat treated to H900 gives you a strong, wear resistant surface that handles the heat and carbon exposure that comes with suppressed shooting. It holds up to thread wear and galling better than softer metals, which matters on a piece that gets threaded and unthreaded repeatedly.
Because the Sig taper shoulder is designed to self-center and index against the mating suppressor mount, it doesn't rely on a crush washer the way a traditional flash hider does. Proper fit comes down to making sure your barrel shoulder matches the taper geometry this hider is cut for.
| UPC | 850044307630 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | STGP1/2X28SIG |
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