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SIG P320 Sights

A sight upgrade is one of the simplest ways to make your P320 feel more “dialed in” for how you actually shoot—low light, range days, duty, competition, or as backup irons for a red dot.

This page is built to help you choose confidently. Browse the collection below, then use the quick guide to match the right height and style to your slide and setup.

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Quick fitment guide (so you buy once)

Before you pick a set, confirm these four things:

1. Your model/variant: Full Size, Compact, Carry, X-Series, M17, or M18

2. Your slide type: standard slide or optics-ready

3. Your goal: low-light visibility, faster front sight pickup, co-witness with an optic, or suppressor clearance

4. Your current sight height (if replacing): many listings use SIG sight height numbers like #6 and #8

If you’re replacing irons and you liked your current point of impact, matching your existing height style is usually the safest move.

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Shop by sight type

Night sights (low-light confidence)

Night sights are a great choice if you want a clear reference when lighting is poor, without changing how your pistol handles day to day.

Best for: carry, duty, home defense, early/late range sessions
Look for: a front sight you can find quickly, and a rear notch that isn’t visually “busy”

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Optic-ready and co-witness sights

If you run a red dot, backup irons can be reassuring. The key is choosing a height that works with your optic and how it’s mounted.

Co-witness basics:

• Absolute co-witness puts more iron in the optic window

• Lower 1/3 keeps the window cleaner while still giving a solid backup picture

• Lower 1/5 minimizes iron presence for the cleanest view

Because mounting methods vary (plate vs direct mount, slide design, optic housing height), always choose a set that clearly states it’s intended for optic use and verify the fit notes for your specific P320 variant.

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Suppressor height sights

These sit taller than standard irons. Some shooters choose them for suppressor clearance, others for a specific sight picture or for certain optic setups.

Best for: suppressed pistols, tall sight picture needs
Look for: durable construction and clear front sight visibility

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Fiber optic and competition-style sights

Fiber optic fronts can be very fast in daylight and under range lighting. Pairing them with a clean rear notch is popular for speed-focused shooting.

Best for: competition, training, bright-light shooting
Look for: a front that “pops” and a rear that helps you call shots

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SIG sight height numbers (#6 and #8) explained

You’ll often see P320-compatible sets described with height numbers such as #6 front / #8 rear or #8 / #8. Think of these as sizing conventions used across many SIG-pattern sight sets.

When to choose which

• If you’re replacing existing irons and your pistol is already zeroed the way you like, match your current height style first

• If you’re building a new setup (optic-ready, suppressor height, competition), choose based on the goal and the product’s stated fitment

If you don’t know your current height, check your pistol’s documentation, original packaging, or the manufacturer’s model notes. When in doubt, contact us with your exact variant and slide type.

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Important note for X-Series and optics-ready slides

Some P320 configurations handle the rear sight differently depending on the slide and optic plate arrangement. That can affect which rear sights are compatible.

If your slide is optics-ready, confirm whether the rear sight is dovetailed into the slide or integrated into a plate system before ordering a rear sight. This one check prevents most “doesn’t fit” headaches.

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Popular brands and sight styles in this collection

You’ll find proven options from well-known makers, including high-visibility carry sights, traditional notch-and-post sets, fiber optic competition options, and tall configurations meant for specialty setups.

Use the filters and product descriptions to narrow by:

• sight type (night, fiber, tall)

• intended use (optic-ready/co-witness)

• variant compatibility (P320, M17, M18, X-Series)

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Why shoppers use MountsPlus for P320 sight upgrades

• A curated selection focused on real-world P320 fitment

• Clear product notes to reduce returns

• Support when you’re deciding between heights or slide types

If you want a fast recommendation, send your exact model, slide type (standard/optics-ready), and whether you’re trying to match current height or build around a red dot.

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FAQ

What are the best sights for a SIG P320?

It depends on use. For carry and defensive use, most people prefer a bright, easy-to-find front with a clean rear sight picture. For range and competition, fiber optic fronts are popular. For optics users, choose sights specifically labeled for co-witness or optic-ready use.

Will these sights fit the P320 M17 or M18?

Many will, but not all. Always check the product’s compatibility notes and confirm whether your slide is standard or optics-ready.

Do I need suppressor height sights if I have a red dot?

Not necessarily. Some red dot setups use tall backup irons, but the correct height depends on optic model, mounting method, and your preferred co-witness style. Choose a set that clearly states its optic intent.

What does “#6” or “#8” mean on SIG sight listings?

They’re common sight height conventions used in many SIG-pattern sight sets. If you’re replacing existing irons and you liked your point of impact, matching your current height style is usually the safest approach.

Are night sights worth it?

If you want a consistent reference in dim conditions without relying on electronics, they’re a solid upgrade. They’re also a popular choice for people who carry or keep a P320 for home defense.

Can I install P320 sights myself?

Some shooters do, but proper tools matter. If you’re unsure or don’t have the right equipment, professional installation can help prevent cosmetic damage and ensure alignment.