The BL prefix was also on some GPMGs. Parker-Hale used UP. https://www.milsurps.com/attachment.php?attachmentid=129544&cid=1&stc=1
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The BL prefix was also on some GPMGs. Parker-Hale used UP. https://www.milsurps.com/attachment.php?attachmentid=129544&cid=1&stc=1