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Brass marks

losacco

Alpha
Any ideas what's causing these marks on the edge the head?

FM9 Pistol brace

Patrick
IMG_6625.jpg
 
From the picture, that primer looks like it maybe a little too deeply indented also.

Is this a build, if so head spacing should always be checked so you don't run into any dangerous conditions. If you don't have head spacing gauges I would recommend talking to a gunsmith.
 
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