Otter Creek Labs M4 Features The M4 collar is machined from steel and finished in black nitride a surface treatment that adds exceptional hardness and corrosion resistance to the steel substrate while providing a clean non-reflective black appearance that integrates naturally with standard suppressor configurations. The black nitride finish holds up to the heat carbon and mechanical stress generated during sustained suppressed fire ensuring the M4 maintains its dimensional integrity and fit across the full service life of the component. Steel construction provides the strength and dimensional stability required for a reliable collar interface within the Otter Creek Labs suppressor system. At just 0.10 lbs. the M4 contributes virtually no additional weight to the overall suppressor system making it an ideal service or replacement collar for shooters who prioritize a lightweight suppressed setup. The collar series designation identifies the M4 as a precision fit component within the Otter Creek Labs suppressor collar ecosystem engineered to the tolerances required for consistent rattle-free fit and reliable function through repeated use. For any Otter Creek Labs suppressor owner in need of a replacement or additional M4 collar this component delivers the factory-correct steel and black nitride solution built to Otter Creek Labs exacting standards. Otter Creek Labs M4 Specifications Manufacturer: Otter Creek Labs Model: M4 Category: Suppressor Accessory Series: Collar Material: Steel Finish: Black Nitride Color: Black Nitride Weight: 0.10 lbs.