AUTHORIZED INSTALLER PROGRAM
FIX THE P320 AT THE SOURCE.
The AST P320 Fire Control Upgrade Kit is a patent-pending, drop-in mechanical sear block for the Sig Sauer P320. It stops forward sear movement, the root of uncommanded discharges, without changing the trigger. Authorized Installers fit it for their customers.
01The problem
The P320 platform, including the M17 and M18, is carried across the U.S. military and many law enforcement agencies. It has also been the subject of litigation and reports of unintended discharges, and some agencies have restricted or removed it from service. Thousands of carriers still rely on it every day.
02The fix
- Physical sear block. A mechanical stop that prevents forward sear movement.
- Drop-in installation. Fitted by a qualified armorer. No frame modification, no special tooling, no serialized parts altered.
- Trigger unchanged. Factory pull and reset are preserved.
- Fits the fleet. All standard P320 variants, including M17 and M18, with or without a manual safety.
| Compatibility | All P320 variants: M17, M18, Full, Compact, Subcompact |
|---|---|
| Versions | Standard and thumb safety |
| Installation | Drop-in by a qualified armorer |
| Frame modification | None |
| Serialized parts altered | None |
| Trigger pull effect | None |
| Testing | Live-fire and handling verified |
| Agency and fleet programs | Available on request |
| Technical data package | Available under NDA on request |
| CAGE code | 131F2 |
| Patent | Pending, US20250164203A1 |
03For gunsmiths and FFLs
Customers are asking about the P320. Authorized Installers get installer pricing, early access to kits, technical documentation and support, co-branded marketing materials, and a listing on our installer locator. Full terms go to approved installers.
04P320 owners: refer your gunsmith
No installer near you yet? Tell us about a gunsmith or shop you trust. We'll contact them about the program and let you know when they're set up.
The AST P320 Fire Control Upgrade Kit is an independently engineered aftermarket enhancement. It is not designed, manufactured, authorized or endorsed by Sig Sauer, Inc. or any affiliated entity. All trademarks are the property of their respective owners. The P320 name is used only to identify compatibility.