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Hi all,


recently got my UMP and want to put a bearing spring guide in it.


was looking at Promethius, Guarder or madbull.


Im aware that the two 'nubs' on the guide are either rounded or square, does anybody know for certain what the UMP has or what will fit.


Please no......'well i think this one MAY work' or 'TRY this one'


I'd like hard fact of what 'will' work not what 'might' work.


Sorry if i sound picky but i only want to do this once





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