--- title: "Gemtech GM-45 USP Piston Core" description: "USP piston core for GM-45 and LUNAR45 suppressors, supporting tool-free thread changes across pistols with different barrel thread patterns." canonical_url: "https://www.kygunco.com/product/gemtech-12191-gm-45-lid-usp-piston-linear-inertial-decoupler" meta: author: KYGUNCO "og:description": "USP piston core for GM-45 and LUNAR45 suppressors, supporting tool-free thread changes across pistols with different barrel thread patterns." "og:image": "https://cdn.kygunco.com/assets/products/218731/thumbnail.jpg?v=1770846971" "og:image:height": "500" "og:image:width": "500" "og:title": "Gemtech GM-45 USP Piston Core" --- > Index of every page on this site: [llms.txt](https://www.kygunco.com/llms.txt) [Home](https://www.kygunco.com/) / [Shooting](https://www.kygunco.com/category/shooting) / [Guns](https://www.kygunco.com/category/shooting/guns) / [Class III](https://www.kygunco.com/category/shooting/guns/class-iii) / [Suppressor Accessories](https://www.kygunco.com/category/shooting/guns/class-iii/suppressor-accessories) / GMT-12191 ![Main product image](https://static.kygunco.com/cdn-cgi/image/f=auto,w=600/assets/products/218731/main.jpg?v=1770846971) For illustration purposes only, this image may not be an exact representation of the product. # GEMTECH GM-45 Lid USP Piston Linear Inertial Decoupler The GEMTECH GM-45 LID USP Piston Linear Inertial Decoupler is an extra piston core for GM-45 and LUNAR45 suppressors. It enables thread changes for use with pistols having different barrel thread patterns and supports multi-caliber flexibility without tools. $135.45 ** 5 interest-free payments of **$27.09** with ![Sezzle logo](https://www.kygunco.com/brands/sezzle.svg) ** Online In Store ** Flat Rate $13.94 for every 25 lbs. Shipping to HI & AK may incur additional fees. ** Ships To Your Home Handled by our expert shippers in Bardstown, KY. ** Partner Fulfilled Selling fast. Limited quantities available. Item # 218731 Style GMT-12191 UPC 609224345814 Condition New Manufacturer [Gemtech](https://www.kygunco.com/brand/gemtech) Weight 1 lb The Extra LID Piston Core is a convenient add-on designed to expand the versatility of your GM™-45 or LUNAR®45 suppressor. Engineered for effortless thread changes, this piston core allows shooters to run a single suppressor across multiple host pistols and calibers without tools or hassle. Simply swap cores to match the appropriate barrel thread pattern and enjoy reliable function, consistent lock-up, and optimal suppressor performance on each platform. FEATURES - Quick Thread Adaptability: Easily convert your suppressor for use on different pistols with varying barrel thread patterns. - Enhanced Compatibility: Purpose-built for GM™-45 and LUNAR®45 suppressors to ensure a precise fit and dependable cycling. - Multi-Caliber Flexibility: Ideal for shooters running multiple pistol calibers who want to maximize suppressor utility. - Solid Construction: Made from durable, high-quality materials to withstand repeated use and harsh conditions. ** WARNING: This product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to [www.p65warnings.ca.gov](https://www.p65warnings.ca.gov). 0.0 ** ** ** ** ** 0 reviews ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ## More from Gemtech ```json {"@context":"https://schema.org","@graph":[{"@id":"https://www.kygunco.com/#website","@type":"WebSite","description":"Shop KYGUNCO for firearms, ammo, accessories, parts, and outdoor gear at low prices with fast, easy nationwide shipping.","name":"KYGUNCO","url":"https://www.kygunco.com/","publisher":{"@id":"https://www.kygunco.com/#/schema/organization/kygunco"}},{"@id":"https://www.kygunco.com/product/gemtech-12191-gm-45-lid-usp-piston-linear-inertial-decoupler#webpage","@type":"WebPage","description":"USP piston core for GM-45 and LUNAR45 suppressors, supporting tool-free thread changes across pistols with different barrel thread patterns.","name":"Gemtech GM-45 USP Piston 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