MR556 Firing Pin is an upper-receiver and bolt-system component identified by SKU 50233703. This page is provided for model identification and educational reference, not installation or firearm-modification guidance.
MR556 Firing Pin specifications and reference details
- SKU: 50233703
- Component type: Firing pin
- Referenced model family: HK MR556
- Category: Upper Receiver Parts
For manufacturer catalog context, consult the official HK Upper Receiver Parts catalog.
MR556 compatibility and related components
The MR556 designation does not establish compatibility with every variant, bolt assembly, production generation, or altered configuration. Confirm the exact firearm, complete assembly, and manufacturer part reference.
Browse Upper Receiver Parts or return to Rifle Parts. Related MR556 references include the MR556 Bolthead Carrier Incomplete and MR556 Ejector.
Identification considerations
Use SKU 50233703, the complete model designation, dimensional verification, and manufacturer documentation. Firing pins that appear similar should not be assumed interchangeable.
Safety and professional service
The firing pin is part of the ignition system and requires qualified inspection and service. Keep the firearm unloaded, remove the magazine, verify the chamber is clear, and physically separate ammunition. A qualified gunsmith should assess wear, compatibility, installation, and function using the manufacturer’s procedures.
Common MR556 Firing Pin questions
Is this identified for the MR762?
No. This listing references the MR556 family.
Should replacement be professionally inspected?
Yes. Ignition-system components require qualified service and function verification.
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