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1/7/2015 8:21:25 PM EDT
I recently completed most of a 6.5 Grendel rifle. I say most because I have yet to finish the barrel and pick up an optic for it. But I have made an unfortunate discovery. The Anderson manufacturing slick side upper I got for it seems to be out of spec. Everything else works flawlessly but it looks like the upper has a little too much material for all but one of my metal magazines to fit properly. Some polymer magazines I have tried will fit, but I have never heard of a polymer 6.5 magazine. Though I would love to try one.

Any suggestions for a fix? I will hopefully be talking to a fellow with some gun smithing experience on Thursday and I think we will wind up stoning or filing the relevant areas down a smidgeon.
1/7/2015 8:32:29 PM EDT
[#1]
Did you try contacting Anderson to see if they'll replace it?
1/7/2015 8:45:24 PM EDT
[#2]
Thought about it but I decided against it since it would be such a headache to disassemble the upper.

But perhaps I should rethink that.
1/7/2015 9:24:22 PM EDT
[#3]
They may have you send in the whole upper to troubleshoot the whole upper. It is worth a try. I've never used Anderson but I've heard good things. I would politely contact them and give them a chance to see what's the dealio!

Good Luck.

PS was it a "blem" upper? It may just be a little sloppy anodizing in mag well.

If you have not installed the barrel, nows the time to send it in. Why is it such a headache? FA and ejection door installed? I would Send the upper if it was mine
1/7/2015 9:24:48 PM EDT
[#4]
Do the magazines have a good fit in the lower? Are we talking about loaded mags or empty?
1/8/2015 9:02:26 PM EDT
[#5]
After doing some further shooting with another lower I ain't sure what's going on, it seems to be working fine now.

Perhaps there was an issue with the lower not the upper. Perhaps the two just don't work well together for some silly reason.
1/8/2015 10:07:12 PM EDT
[#6]
Good to know. Thanks.
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