Custom Smith MFG has shown support for the HK MP5 22lr with their new Picatinny rail end cap.
Custom Smith MFG states “Get a rear Pic Rail End Cap to go on your HK MP5/22LR Pistol. You can now SBR the Pistol or Keep it as is and put a Brace on it.
This is specifically made to fit this MP5/22 and will not fit real MP5s.”
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