Last updated July 25, 2026. The SIG Sauer P322 rewrote the rules for rimfire pistols the day it landed: 20+1 rounds of .22 LR, optics-ready out of the box, threaded barrel adapter in the case, and fiber-optic sights standard, all for around four hundred bucks. It is a plinker, a trainer, and a small-game gun rolled into one high-capacity package. After a few thousand rounds of everything from bulk-pack to match ammo, here is the honest verdict.
How we tested: Every pick here was run through our testing methodology. Minimum round counts, accuracy and reliability protocols, the failures that disqualify a gun. If we haven't shot it, we don't recommend it.
SIG P322 Specifications
| Action | Semi-auto, blowback (fixed barrel) |
| Caliber | .22 LR |
| Capacity | 20+1 (flush-fit magazine) |
| Barrel | 4″ (threaded 1/2×28 adapter included) |
| Sights | Fiber-optic front, adjustable rear; optics-ready plate |
| Weight | ~17 oz unloaded |
| Controls | Ambidextrous safety and slide catch, flat trigger |
| Street price | ~$380 to $450 |
Why 20+1 Changes Everything
Most rimfire pistols top out at 10 rounds. The P322 doubles that with a cleverly stacked 20-round magazine that still sits flush with the frame, and SIG ships two of them in the box. On a plinking afternoon that means less reloading and more shooting; as a trainer it lets you run the same drills you would with a duty pistol without burning centerfire ammo. Add the included threaded-barrel adapter for a suppressor and the optics-ready slide for a micro red dot, and the P322 is genuinely the most feature-loaded rimfire pistol you can buy at the price.
How the P322 Shoots
The flat trigger breaks cleaner than any factory rimfire pistol has a right to, and the fiber-optic front sight is fast to pick up in daylight. Recoil is essentially nonexistent, so follow-up shots are lightning quick, and the full-size grip fills the hand better than the tiny plinkers it competes with. Like every .22 semi-auto it can get ammo-picky: the P322 runs best on higher-velocity loads and can stumble on the weakest bulk-pack promotional ammo, so feed it CCI or similar and it eats everything. Keep the fixed barrel and breech face clean and reliability stays excellent.
P322 Variants
SIG sells the P322 in a few flavors. The standard model already includes the threaded adapter and optics plate; the bundles and the compensated version add convenience or muzzle control for suppressor and competition use.
SIG P322 (Standard) From ~$399
SIG P322 TacPac From ~$479
SIG P322-COMP From ~$499
Where to Buy the SIG P322
The P322’s toughest rivals are the proven Ruger Mark IV and the value-leading Taurus TX22. The Mark IV is the accuracy and reliability benchmark; the TX22 undercuts everyone on price. The P322 splits the difference with the highest capacity and the most in-the-box features. Compare live prices below, and see the full field in our best .22 LR pistols guide.
Who Should NOT Buy the SIG P322
- Bullseye accuracy chasers: for the tightest one-hole groups, the Ruger Mark IV‘s heavier target barrel still edges it out.
- The most budget-conscious buyers: if capacity and threaded barrels don’t matter to you, the Taurus TX22 does the basics for less money.
- Shooters who only run cheap bulk ammo: the P322 rewards decent ammo. If you insist on the weakest promo rounds, expect occasional stumbles.
- Anyone wanting a pocket .22: this is a full-size pistol. For carry, look at a smaller rimfire or a micro-compact centerfire.
The Verdict
The SIG P322 is the most gun you can get in a rimfire pistol for around $400: 20+1 capacity, an excellent flat trigger, fiber-optic sights, an optics-ready slide, and a threaded adapter, all standard. It gives up a hair of ultimate accuracy to the Ruger Mark IV and costs a little more than the Taurus TX22, but nothing else packs this many features into one case. For training, plinking, and suppressed fun, it is our top rimfire recommendation. See how it ranks against the field in our best .22 LR pistols guide, or explore more picks in best handguns. Rimfire rifle shooters should also read our Ruger 10/22 review.
Our Rating: 9 / 10 — the most feature-packed rimfire pistol at the price, and a genuine joy to shoot.
SIG P322 FAQ
Is the SIG P322 a good gun?
Yes. The SIG P322 is one of the best-value rimfire pistols available, offering class-leading 20+1 capacity, an optics-ready slide, fiber-optic sights and a threaded barrel adapter all standard for around $400.
How many rounds does the SIG P322 hold?
The P322 holds 20+1 rounds using its flush-fit 20-round magazine, roughly double the capacity of most rimfire pistols. SIG ships two magazines in the box.
Is the SIG P322 optics ready?
Yes. The P322 slide is optics-ready and accepts a micro red dot using the included mounting plate, no gunsmithing required.
Does the SIG P322 come with a threaded barrel?
The standard P322 includes a 1/2x28 threaded barrel adapter in the case, so it is suppressor-ready out of the box.
SIG P322 vs Taurus TX22 - which is better?
The TX22 is lighter on the wallet and a proven performer, while the P322 offers higher 20+1 capacity, fiber-optic sights and an included threaded adapter. Choose the TX22 for value, the P322 for features and capacity.
SIG P322 vs Ruger Mark IV - which is better?
The Ruger Mark IV is the accuracy and reliability benchmark with its heavier target barrel, while the P322 wins on capacity, features and out-of-the-box suppressor readiness. The Mark IV for bullseye accuracy, the P322 for versatility.
Is the SIG P322 ammo picky?
Like most .22 semi-autos, the P322 runs best on higher-velocity ammo such as CCI and can occasionally stumble on the weakest bulk-pack promotional rounds. Feed it decent ammo and reliability is excellent.
How much does a SIG P322 cost?
Street prices for the SIG P322 typically run from about $380 to $450 depending on configuration.
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