The MR556/MR762 Sear Spring is a small spring referenced for the fire-control system of the stated HK platforms. This page is an identification and compatibility reference and does not provide installation or modification instructions.
MR556/MR762 Sear Spring specifications and reference details
- HK part number/SKU: 50233149
- Component type: sear spring
- Referenced platform: HK MR556 and MR762, as identified by HK
- Assembly area: fire-control assembly
HK lists this part in its rifle-parts inventory. Confirm the current catalog entry through the official HK Lower Receiver Parts catalog.
Model compatibility and related components
Spring rate, dimensions and revision matter; identify it by the exact HK part number rather than appearance. Related references include Sear Spring, Sear Release Rocker, MR762 Disconnector, and MR762 Recoil Spring. Browse Lower Receiver Parts or return to Rifle Parts.
Identification considerations
Use HK part number 50233149, the complete component name, host markings and current parts diagrams together. Similar-looking springs and fire-control parts may differ in geometry, tension, material or revision.
Safety and professional service
Fire-control safety notice: Incorrect fit, engagement or assembly can cause unsafe operation. Do not modify, reshape or substitute this component.
Keep the firearm unloaded and follow current operator and armorer documentation during inspection or service. Installation, inspection and complete safety/function testing should be performed by HK or a qualified firearms professional. The completed firearm must remain in a lawful factory-compatible configuration.
Common MR556/MR762 Sear Spring questions
Can this part be selected by appearance?
No. Use the exact HK part number and model documentation.
Is it interchangeable across all MR rifles?
No. Fit can depend on caliber, model generation, receiver configuration and related components.
Is professional service required?
Professional installation and safety testing are strongly recommended, especially for fire-control components.
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