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The Range
Rifle & Shotgun Discussion
DPMS AR-10 problem
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<blockquote data-quote="aviator41" data-source="post: 2831210" data-attributes="member: 30309"><p>you might try retaking your photos so that the primer end of the cases are in focus, not the background. It's hard to see what's going on with what you've got posted.</p><p></p><p>However my first guess is Firing Pin protusion is WAY out of spec. that will cause the drag marks your seeing as well as the primers unseating. if you don't have a FP protusion guage, you might consider getting one, or at least a good set of calipers. either can be used. Between excessive FP protrusion and a bolt at the limits of headspace, then wearing in as you shot it, you get the results you've listed.</p><p></p><p>This is not all that uncommon with DPMS bolts. Their tolerances are a bit "loose" by most standards.</p><p></p><p>Make some reduce rounds and see if the problem diminishes or goes away. if not, you may have to get the bolt bushed. or replaced. Since you're shooting handloads through it, your warranty is void so be prepared to pony up the dough.</p></blockquote><p></p>
[QUOTE="aviator41, post: 2831210, member: 30309"] you might try retaking your photos so that the primer end of the cases are in focus, not the background. It's hard to see what's going on with what you've got posted. However my first guess is Firing Pin protusion is WAY out of spec. that will cause the drag marks your seeing as well as the primers unseating. if you don't have a FP protusion guage, you might consider getting one, or at least a good set of calipers. either can be used. Between excessive FP protrusion and a bolt at the limits of headspace, then wearing in as you shot it, you get the results you've listed. This is not all that uncommon with DPMS bolts. Their tolerances are a bit "loose" by most standards. Make some reduce rounds and see if the problem diminishes or goes away. if not, you may have to get the bolt bushed. or replaced. Since you're shooting handloads through it, your warranty is void so be prepared to pony up the dough. [/QUOTE]
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