Here are the 3 best Sig P322 red dot sights that are compatible right out of the box.
Sig Romeo Zero Elite
The Sig Romeo Zero Elite is for any Sig P322 owners that want an Sig Sauer branded RMSc footprint red dot sight and without spending over $300 for an optic.
Suited For 22LR Use - For the money, this optic is rated for 22LR use
Much More Impact Resistant - The shroud protects polymer frame ROMEO Zero underneath
New Glass Lens - Aspherical glass lens eliminates glass edge distortion (Not polymer lens)
Touch Activation - The new TAP (Touch Activated Programming) allows people with big hands to adjust the brightness without messing around with small buttons
Super Lightweght - Even with the metal shroud, the optic still weighs like nothing
Multi-Reticle Options - Choose between a single dot or a 32 MOA ring dot
The Holosun HS507K X2 micro red dot sight is very popular for all RMSc footprint pistols. This one is a top option for the Sig P322.
Fast Target Red Dot Acquisition - Shoot 22 LR at bowling pins, cans and steel plates with ease
Activates via motion sensor - The Holosun ShakeAwake technology instantly activates the red dot reticle upon sensing motion & deactivates when not in motion to save more battery juice (CR1632 battery)
Recoil Proven Glass Lens - This optic works on a 357 Sig, so shooting 22 LR is not a problem at all
Simple battery change without hassle - Access battery from the side tray instead of the bottom. No sight removal or re-zeroing required
The Swampfox Sentinel is a top selling RMSc red dot sight, and it's a great 7075 T6 aluminum body optic for the Sig P322. It mounts DIRECTLY to P322 slide without any mod
Durable Slim Body - The forged body is just like the 507K X2 for reliable duty carry but with a much slimmer lens hood profile
Extra Protection - The IRONSLIDES SHIELD can add additional lens hood protection against barricade racking, drop, and other physical impacts to protect the internals.
Low Profile Lens Hood - Aim with both eyes open without thick lens frame getting in the way
Manual Model - Sentinel-M resumes its previous brightness level. Highly recommend manual version for indoor low light use.
Auto Model - A photosensitive ambient light sensor provides dot brightness relative to ambient lighting conditions.