Product Description The XTech Tactical MTX 365 magazine extension upgrades your SIG Sauer P365 factory 12-round 9mm magazine by adding +3 rounds for increased capacity and improved purchase. Designed to reuse your original magazine body, this extension kit includes a custom-engineered extended spring to promote consistent feeding and dependable last-round hold open. Built specifically for standard P365 frames, it&';s a practical capacity and control upgrade for everyday carry or range use. Product Highlights Adds +3 rounds to factory SIG Sauer P365 12-round 9mm magazines (converts 12 to 15). Custom-engineered extended spring for reliable feeding and last-round hold open. Designed for standard P365 grip frames; does not fit X or XL grip modules. Reuses the original magazine housing for a straightforward capacity upgrade. Innovative patented design (US 11,408,697 B2 and US 11,168,954 B1). Specs Brand: XTech Tactical Product Type: Magazine extension / +3 basepad kit Compatibility: SIG Sauer P365 factory 12-round magazines (standard P365 frame only) Caliber: 9mm Luger Color: Black Manufacturer Part Number: XT3020501 UPC: 856822007822 Patents: US 11,408,697 B2; US 11,168,954 B1 Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer.