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The FN Five-seveN is a blast to shoot suppressed, but its metric M10x1 muzzle threads don't play nice with most rimfire cans out of the box. That's the whole reason this little piece of steel exists. The SilencerCo Delta Adapter FN (part number AC77) threads onto your Five-seveN's factory barrel and gives you a standard 1/2×28 mounting point, which is the same pitch nearly every rimfire suppressor on the market uses. Spin it on once and your pistol is ready for quiet range days from then on.
Anyone who has run a direct-thread suppressor knows the annoyance of a can slowly backing off between magazines. The Delta Adapter uses O-ring engagement to put constant tension on the suppressor threads, so it stays put shot after shot instead of working loose while you're trying to enjoy yourself. That same O-ring also helps seal out carbon and grit, keeping the threads cleaner than a bare metal-on-metal fit ever would. It's a simple design touch that makes a real difference over a long shooting session.
On the suppressor side, this adapter pairs with SilencerCo's full rimfire lineup, including the Sparrow 22, Switchback 22, Spectre 22, Warlock 22, and Osprey Micro, along with pretty much any other rimfire suppressor threaded 1/2×28. On the pistol side, it's built specifically for the FN Five-seveN's M10x1 threads, so double check your barrel before ordering if you're running an aftermarket setup.
Steel construction with a black finish means this adapter shrugs off heat and handling without fuss, and at well under a tenth of a pound you'll forget it's even there. SilencerCo includes a thread protector in the package too, so your new 1/2×28 threads stay protected on days when the suppressor stays home. Install it, leave it on, and stop thinking about thread pitch for good.
Yes. Once installed, the adapter presents standard 1/2×28 threads, which is the most common rimfire suppressor pitch out there. It works with SilencerCo's rimfire lineup like the Sparrow 22, Switchback 22, Spectre 22, Warlock 22, and Osprey Micro, as well as most other rimfire suppressors threaded 1/2×28.
The O-ring puts steady tension on the suppressor threads so the can doesn't slowly back off while you shoot, which is a common headache with plain direct-thread mounts. It also helps keep carbon and debris off the threads, so cleanup is easier and the fit stays consistent over time.
Yes, this adapter installs on the FN Five-seveN's factory M10x1 muzzle threads. It doesn't add threads to an unthreaded barrel. If your barrel already has the standard FN metric threading, this converts it to 1/2×28 in seconds.
It does. SilencerCo includes a thread protector in the package, so your 1/2×28 threads stay covered and clean whenever you're shooting without the suppressor attached. The protector benefits from the same O-ring engagement, so it won't rattle loose on you either.
| UPC | 817272010046 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | AC77 |
| Caliber/Gauge | 5.7 x 28 mm |
| Color | Black |
| Model | |
| Product Type | Accessory-Silencer Accessories |
| Shipping Weight | 0.05 |
| Thread Pattern | 1/2"x28 |
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