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SilencerCo
The SilencerCo AC77 Delta 1/2"x28 threaded adapter lets you quickly convert your .22 rimfire barrel to suppressor-ready configuration. If you already own a SilencerCo .22 can and want to shoot it on another firearm, or you're building out a dedicated suppressed .22 setup, this adapter threads directly onto 1/2"x28 muzzles and pairs with SilencerCo's full lineup of compact .22 suppressors. The Delta design uses o-ring engagement at the interface, which keeps your muzzle threads clean and prevents the suppressor from loosening under recoil—a practical detail that matters when you're running suppressed .22s regularly at the range or in the field.
The 1/2"x28 pitch is the most common thread standard for .22 rifles and pistols, including modern bolt guns, AR platforms, and specialty .22 hosts. If your barrel already sports this thread or you're having one cut, this adapter slides on and locks in with minimal fuss. The o-ring seal keeps things tight shot after shot, so you're not constantly re-engaging your suppressor between strings.
SilencerCo's Delta family is engineered around the company's proven .22 suppressors—the Sparrow 22, Spectre 22, Switchback 22, Warlock 22, and Osprey Micro 22 all mate with Delta adapters. That means if you own one of these cans, you can move it between compatible hosts without buying new hardware. The black finish matches most modern .22 builds and wears well on the line.
| Thread Pitch | 1/2"x28 |
| Color | Black |
| Type | Muzzle Adapter |
| Compatible Suppressors | SilencerCo Sparrow 22, Spectre 22, Switchback 22, Warlock 22, Osprey Micro 22 |
The AC77 Delta threads onto any .22 barrel with 1/2"x28 muzzle threads. This is the industry standard for modern .22 LR rifles, AR-pattern .22s, and many .22 pistols. If your barrel is threaded to a different pitch (like M10x1), this adapter won't fit. Check your barrel's thread specification before ordering.
The AC77 Delta is designed for use with SilencerCo's Sparrow 22, Spectre 22, Switchback 22, Warlock 22, and Osprey Micro 22 suppressors. If you own one of these cans, this adapter lets you move it between compatible hosts.
The o-ring creates a seal at the suppressor interface, keeping your muzzle threads clean and preventing the suppressor from loosening during firing. This reduces maintenance and ensures a consistent, solid connection shot to shot.
No. The FN Five-seveN uses an M10x1 thread pitch, not 1/2"x28. SilencerCo does make adapters for other thread standards, but the AC77 Delta is specifically for 1/2"x28 barrels.
SilencerCo
The SilencerCo AC77 Delta 1/2"x28 threaded adapter lets you quickly convert your .22 rimfire barrel to suppressor-ready configuration. If you already own a SilencerCo .22 can and want to shoot it on another firearm, or you're building out a dedicated suppressed .22 setup, this adapter threads directly onto 1/2"x28 muzzles and pairs with SilencerCo's full lineup of compact .22 suppressors. The Delta design uses o-ring engagement at the interface, which keeps your muzzle threads clean and prevents the suppressor from loosening under recoil—a practical detail that matters when you're running suppressed .22s regularly at the range or in the field.
The 1/2"x28 pitch is the most common thread standard for .22 rifles and pistols, including modern bolt guns, AR platforms, and specialty .22 hosts. If your barrel already sports this thread or you're having one cut, this adapter slides on and locks in with minimal fuss. The o-ring seal keeps things tight shot after shot, so you're not constantly re-engaging your suppressor between strings.
SilencerCo's Delta family is engineered around the company's proven .22 suppressors—the Sparrow 22, Spectre 22, Switchback 22, Warlock 22, and Osprey Micro 22 all mate with Delta adapters. That means if you own one of these cans, you can move it between compatible hosts without buying new hardware. The black finish matches most modern .22 builds and wears well on the line.
| Thread Pitch | 1/2"x28 |
| Color | Black |
| Type | Muzzle Adapter |
| Compatible Suppressors | SilencerCo Sparrow 22, Spectre 22, Switchback 22, Warlock 22, Osprey Micro 22 |
The AC77 Delta threads onto any .22 barrel with 1/2"x28 muzzle threads. This is the industry standard for modern .22 LR rifles, AR-pattern .22s, and many .22 pistols. If your barrel is threaded to a different pitch (like M10x1), this adapter won't fit. Check your barrel's thread specification before ordering.
The AC77 Delta is designed for use with SilencerCo's Sparrow 22, Spectre 22, Switchback 22, Warlock 22, and Osprey Micro 22 suppressors. If you own one of these cans, this adapter lets you move it between compatible hosts.
The o-ring creates a seal at the suppressor interface, keeping your muzzle threads clean and preventing the suppressor from loosening during firing. This reduces maintenance and ensures a consistent, solid connection shot to shot.
No. The FN Five-seveN uses an M10x1 thread pitch, not 1/2"x28. SilencerCo does make adapters for other thread standards, but the AC77 Delta is specifically for 1/2"x28 barrels.
