The I-37 release valve, found on the PTS MATEN, AR-15, Masada, and LM4 Series magazines, uses the external o-rings found in the photo below:
O-Ring Sizes on the I-37 Magazine Release Valve
The I-37 release valve, found on the PTS MATEN, AR-15, Masada, and LM4 Series magazines, uses the external o-rings found in the photo below:
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