Description
The Sig Sauer P320 Compact 10 Round is the pistol that changed how handguns are sold. Its serialized part is not the frame you hold but a small stainless chassis inside it, which means one purchase can become a compact, a full size or a carry gun by swapping parts rather than buying another firearm. This listing is the reduced-capacity build with an optics cut already milled. Part 320C-9-BSSP-10, UPC 798681699117.
Modularity Is the Whole Idea
On a conventional pistol the frame is the firearm. On the P320 the serialized fire control unit lifts out of the polymer grip module, which makes the grip a consumable part rather than a permanent commitment. Buy a Sig Sauer P320 Compact 10 Round today, decide in a year that you want a full-size grip and a longer slide, and you are buying parts rather than starting another background check.
The modularity of the Sig Sauer P320 Compact 10 Round is why the US Army adopted the platform as the M17 and M18. It is also why the aftermarket around it is enormous: grip modules in three sizes and a dozen textures, slides in every length, and triggers from several makers all fit the same chassis.
The specification on the Sig Sauer P320 Compact 10 Round is solid without being exotic. A 3.9-inch carbon steel barrel with a DLC coating, a black Nitron slide, a medium compact polymer grip module with an accessory rail, and a three-point takedown that needs no tools and no trigger press.
Optics and Sights
The Sig Sauer P320 Compact 10 Round slide is cut for a P320 optic ready PRO footprint, which is SIG’s own pattern and is shared by the ROMEO series. A dot bolts directly to the slide with no milling, no gunsmith and no broken finish. If your preferred optic uses a different footprint, an adapter plate solves it at the cost of a little extra height, so work out which sight you want before ordering.
Underneath sit SIGLITE front and rear night sights. Tritium vials glow without needing to gather light first, unlike fibre optic sights which go dark in a dark room, and they keep working for the ten to twelve year life of the vials. On the Sig Sauer P320 Compact 10 Round that gives you a dot for speed and irons that work when a battery does not.
The trigger on the Sig Sauer P320 Compact 10 Round is the standard P320 striker unit: a consistent pull every shot with no double-action first press to learn. Combined with the low bore axis the platform is known for, the pistol tracks flat and returns to the same place between shots.
- Part: 320C-9-BSSP-10, UPC 798681699117
- Caliber: 9mm Luger
- Barrel: 3.9 in. carbon steel with DLC coating
- Action: striker-fired, modular serialized fire control unit
- Slide: black Nitron, cut for PRO optic footprint
- Grip module: medium compact polymer with accessory rail
- Sights: SIGLITE front and rear night sights
- Takedown: three-point, no tools, no trigger press
- Capacity: 10+1, two 10-round steel magazines included
Honest Caveats Before You Buy
Capacity is the constraint on this build. Ten rounds is what ships, and standard P320 compact magazines holding 15 rounds drop straight in where the law allows. Pennsylvania has no capacity limit, so treat the Sig Sauer P320 Compact 10 Round as a pistol that arrives with two spare-priced magazines and budget for a few 15-rounders.
On the platform: SIG ran a Voluntary Upgrade Program for the P320 in 2017 that addressed drop safety, and current production ships with that updated trigger group. If you are ever buying a used P320 rather than a new one, confirm the upgrade status with the seller. A new Sig Sauer P320 Compact 10 Round from a dealer already has it.
Optic footprint catches P320 buyers out. The PRO footprint is not the same as an RMR or Holosun K pattern, so confirm compatibility before ordering a red dot. An adapter plate works but raises the sight and changes how it lines up with the SIGLITE irons underneath.
And modularity has a cost most people do not anticipate: it is a rabbit hole. Grip modules, slides, triggers and barrels all fit, and it is easy to spend more on parts than the pistol cost. That is a feature if you enjoy it and an expense if you do not.
Who it suits: buyers who want one serialized pistol that can change shape later, shooters in capacity-restricted states who want an optics cut and night sights without compromise elsewhere, and anyone who liked the M17 or M18 and wants the civilian version. The Sig Sauer P320 Compact 10 Round is a sensible, flexible starting point. MAG5 Firearms is a family-owned FFL in Collegeville, Pennsylvania, with transfers, cleaning and gunsmithing in-house by appointment.
Browse more handguns in stock at MAG5 Firearms, or read the manufacturer specifications on the SIG SAUER P320 Compact page before you order.
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