Description
The SIG P322 22LR 4″ TB 20RD ROMEO RS is a purpose-built .22 LR semi-auto pistol designed and manufactured right here in New Hampshire by SIG SAUER. It ships with a Romeo RS compact red dot optic installed, a threaded barrel adapter for suppressor use, and a 20-round magazine. This model delivers the highest capacity in its class, ambidextrous controls, and interchangeable trigger options, making it a serious choice for training, plinking, and small-game hunting.
| Manufacturer | SIG SAUER |
|---|---|
| Model | P322 |
| Caliber | .22 Long Rifle |
| Barrel Length | 4 inches (threaded with adapter) |
| Capacity | 20 rounds |
| Optic | Romeo RS Compact Red Dot (included) |
| Frame Material | Polymer |
| Slide Material | Stainless steel with black finish |
| Sights | Fiber optic front and rear |
| Trigger | Interchangeable flat and curved (both included) |
| Controls | Ambidextrous manual safety and slide catch |
| Weight | 17.5 ounces (unloaded, per manufacturer specs) |
| Condition | New |
Key Features
- Romeo RS Compact Optic Included — Why it matters: You get a factory-installed red dot right out of the box, saving you the cost and hassle of adding one later. The Romeo RS is tough, reliable, and co-witnesses with the fiber optic front sight.
- Threaded Barrel with Adapter — Why it matters: This pistol is suppressor-ready from the factory. Slip on your favorite .22 can and shoot quieter than a pellet gun, perfect for backyard practice or discreet pest control.
- 20-Round Magazine — Why it matters: More rounds mean more time shooting and less time reloading. At 20 rounds, the P322 outruns most other .22 pistols on the market, giving you a serious edge at the range or in a competition.
- Interchangeable Flat and Curved Triggers — Why it matters: Every shooter has a preference. Whether you like a flat trigger for fast follow-ups or a curved trigger for a classic feel, you can swap them in minutes without gunsmithing.
- Ambidextrous Controls — Why it matters: Left-handed shooters get the same easy access to the slide catch and safety as right-handed shooters. This pistol works for everyone in the family, no modifications needed.
Who It’s For
This SIG P322 is built for the southern shooter who wants a reliable .22 pistol for training, plinking, or teaching new shooters. If you’re a dove hunter who likes to keep your skills sharp between seasons, this gun’s low recoil and red dot make it a joy to run through hundreds of rounds. It’s also ideal for anyone who wants a suppressor host without spending big money on a centerfire pistol.
Pros & Cons
- Pro: Highest capacity .22 pistol in its class — 20 rounds standard.
- Pro: Factory-installed Romeo RS red dot saves you $150+ over buying separately.
- Pro: Threaded barrel with adapter means you’re suppressor-ready immediately.
- Con: The polymer frame, while lightweight, doesn’t have the same heft as an all-metal .22 pistol, so some shooters may find it feels a little light in the hand.
Comparison vs. Competitors
| Feature | SIG P322 22LR TB ROMEO RS | Zev Technologies OZ9 .22 | Agency Arms Glock 44 |
|---|---|---|---|
| Capacity | 20 rounds | 15 rounds | 10 rounds |
| Optic Included | Yes (Romeo RS) | No | No |
| Threaded Barrel | Yes (with adapter) | Optional extra | No |
| Trigger Options | Interchangeable flat/curved | Flat only | Curved only |
| MSRP | $529.99 | $699.00 | $449.00 |
The P322 clearly wins on capacity, included optic, and suppressor readiness. While the Glock 44 is cheaper, you’ll spend more to add a red dot and threaded barrel. The Zev OZ9 is a fine gun but costs significantly more without giving you a higher capacity.
FAQ
Will the SIG P322 cycle reliably with standard velocity .22 LR ammo?
Yes, per SIG SAUER specs, the P322 is designed to cycle with a wide range of .22 LR ammunition, including standard velocity loads. However, for best results during the first 200 rounds, we recommend high-velocity ammo like CCI Mini-Mags to help break in the recoil spring.
Can I use my existing SIG SAUER holster with the P322?
The P322 has a unique frame shape and slide profile. Most standard SIG holsters (like those for the P320 or P365) will not fit. We recommend holsters specifically molded for the P322. Many kydex holster makers now offer P322-compatible models.
Does the Romeo RS optic hold zero on a .22 pistol?
Absolutely. The Romeo RS is built to handle the recoil of centerfire pistols, so it’s more than tough enough for .22 LR. It uses a motion-activated shake-awake feature and has a 2 MOA dot that stays crisp and consistent.
Is the threaded barrel adapter easy to remove for non-suppressed use?
Yes, the adapter simply threads onto the barrel and can be removed by hand or with a standard tool. Without the adapter, the barrel is flush with the slide, so you can shoot it without a suppressor just fine.
Why Buy From Us
- ✅ Nationwide delivery to all 50 states
- ✅ Ships within 1–2 business days from our FFL
- ✅ 30-day return policy on unfired, new firearms
- ✅ Secure checkout with encrypted payment processing
Last updated: April 2026
According to NSSF data, .22 LR pistols account for over 30% of all handgun sales in the U.S., and the SIG P322 is leading the pack with its combination of capacity, included optic, and suppressor readiness.
Explore more: Semi Auto Handguns | .22 LR Pistols | SIG SAUER
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