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Rimfire suppressors have a bad habit of walking loose after a few hundred rounds, and carbon fouling on muzzle threads only makes things worse. SilencerCo tackled both problems with the Delta Adapter. This little stainless steel piece threads onto any standard 1/2×28 muzzle and gives you an O-ring engagement surface that seals out fouling and keeps your can snugged down through long range sessions. No more stopping every couple magazines to re-tighten.
The AC3 version converts 1/2×28 to 1/2×28, which sounds redundant until you understand the point. It shortens the exposed thread length from 0.6 inch to 0.4 inch while adding the O-ring interface, so barrels with longer thread sections get a proper shoulder for the suppressor to seat against. It also adds roughly 0.75 inch to your barrel, which comes in handy on setups where the muzzle sits flush with or just behind the handguard and you need a bit of extra reach to mount anything at all. Owners running .22 LR conversion kits in AR-15s find it works particularly well for that job.
This adapter pairs with SilencerCo rimfire cans like the Sparrow 22, Switchback 22, Spectre 22, Warlock 22, and Osprey Micro 22, but it is not a closed system. Any rimfire suppressor threaded 1/2×28 from any manufacturer will spin right on. SilencerCo includes a thread protector in the package, and it has the same O-ring engagement, so your threads stay covered and clean when the can is off the gun.
At a hair over an ounce and a half of shipping weight, you will forget it is there until you notice your suppressor has not budged all day. The black finish blends in with most barrels, and installation takes seconds with no gunsmithing required on an existing threaded barrel. It is one of those inexpensive add-ons that quietly fixes an annoyance most rimfire suppressor owners just learn to live with.
Yes. While SilencerCo built it with their own rimfire line in mind, including the Sparrow 22, Switchback 22, Spectre 22, Warlock 22, and Osprey Micro 22, any rimfire suppressor with 1/2×28 threads will mount on it. The O-ring engagement benefit carries over regardless of who made your can.
Two main reasons. First, the O-ring interface keeps carbon fouling off your muzzle threads and prevents the suppressor from loosening during fire, which is a common headache with rimfire cans. Second, it shortens long 0.6 inch thread sections to 0.4 inch so the suppressor seats properly, and it adds about 0.75 inch of length for barrels that sit flush with the handguard.
It does. The included thread protector features the same O-ring engagement as the adapter itself, so your threads stay protected and clean whenever the suppressor is off the firearm.
Yes, that is one of the more popular uses for it. The adapter pairs well with AR-15 rimfire conversion setups and gives you a solid, secure mounting point for a 1/2×28 threaded rimfire suppressor. Just make sure your barrel already has 1/2×28 threads, since this adapter is designed for existing threaded barrels.
| UPC | 817272010039 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | AC3 |
| Caliber/Gauge | .22 LR |
| Color | Black |
| Model | |
| Product Type | Accessory-Silencer Accessories |
| Shipping Weight | 0.05 |
| Thread Pattern | 1/2"x28 |
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