Sig Sauer® Compatible P320™ Lower Parts Kit – 9mm/.40/.357 | Polymer80

About this product

Complete Your Sig Sauer® P320™ Compatible Build with Our Lower Parts Kit

Elevate your firearms project with the Polymer80 Sig Sauer® Compatible P320™ Lower Parts Kit, designed for 9mm, .40 S&W, and .357 SIG calibers. This comprehensive kit includes all essential components to assemble your MUP-1 jig and create a fully functional lower receiver, which is legally classified as the firearm. Perfect for enthusiasts and builders, this LPK ensures reliability and performance, backed by Polymer80’s reputation for quality in the firearms community.

What’s Included in the Kit

• Trigger stop pin
• Slide catch lever pin
• Safety lever pin
• Sear pivot pin
• Split coil pin
• Slide catch lever spring post
• Take down safety lever
• Safety lever
• Slide catch
• Sear
• O-ring
• Take down lever
• Slide catch assembly
• Spring, slide catch lever
• Spring, sear (2)
• Trigger bar spring
• Spring, takedown lever
• Flat Faced Trigger
• Trigger bar
• Sear housing
• Manual disconnector

Technical Specifications and Compatibility

This lower parts kit is engineered for compatibility with Sig Sauer® P320™ models in 9mm, .40 S&W, and .357 SIG. It features high-quality materials for durability and includes a flat-faced trigger for enhanced ergonomics. Note: Not compatible with .45 ACP chambered builds. Ideal for custom builds, this kit supports easy assembly and interchangeability with various frames and slides, making it a versatile choice for your Polymer80 projects.

Why Choose Polymer80?

With years of expertise in firearms manufacturing, Polymer80 provides trusted components that meet rigorous standards. Our products are designed for enthusiasts who value precision and reliability. This LPK is no exception, offering everything you need for a successful build. Always follow local laws and safety guidelines during assembly.