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Discussion Starter · #1 ·
Anyone else notice really badly cratered primers? I've fired commercial American Eagle and Military M193.
 

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[/email You need to call Robinson Arms As Soon As Possible (ASAP) and let them know of the problem. They will take care of you. DON'T shoot the rifle until fixed. :2cents:

There is a blog, here on the forum, about bolt problem/pierced primer by RobArms (Kolob). Be safe call RobArms.
 

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I picked up my rifle in August and have noticed the same thing happening. It looks like the primer is being flatten and extruded into the firing pin hole. Not really a crater. What's up Terra?
 

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Some bolts are missing a chamfer that prevents these issues from having. If you are concerned, you are more than welcome to send the bolt in to me for inspection.

2090 N Redwood Rd
Suite 40
Salt Lake City, UT 84116
 

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Terra Mlebler has told me on the Canadian Gun nutz forum that he is having this issue as well. Will he have problems sending you his bolt.
 

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Was told not to worry about it, gun is running 100% anyway, seems a lot at XCR's crater the primer......but I will be watching for punctured primers. Thanks for your help Terra!
 

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I just got my XCR back for repair witha new bolt and carrier. I test fired it and the gun ran great with no problems in 300 rounds of mixed ammo. All my primers look EXACTLY like the above pictures.

This is normal for the XCR, right?
 

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I'll be able to tell you more when I have my bolt and carrier back. Hopefully they're on the way to my door as I type this. Subtle Hint, Terra! Apparently the cratering is normal. If you reload, it is kinda handy because you can easily separate your fired brass from other stuff while doing your end-of-range-session hands-and-knees slither through the broken glass, rusty nails and venomous vermin while trying to look like a dedicated sportsman instead of a cheapskate.
 

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the cratering in those photos isn't that bad. Sometimes re-chamfering can lessen it, but there will always be some. When the primers are completely pushed up, however, your bolt probably has too much chamfering.
 

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Discussion Starter · #14 ·
the cratering in those photos isn't that bad. Sometimes re-chamfering can lessen it, but there will always be some. When the primers are completely pushed up, however, your bolt probably has too much chamfering.


That seems odd Terra. It seems that the crater is caused by the flow of the primer into the chamfer around the firing pin, if the bolt is re-chamfered wouldn't that only make the cratering worse?
 
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