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Discussion Starter #1
I'm trying to find out what the rule is on changing uppers to a different caliber. I submitted Form 1 for a 6.8. Would it also be legal to run a 12.5 in 223 Wylde on the lower? Thanks for the info.
 

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I believe you need to send them a letter disclosing modifications. I believe I read that on their website.

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Not a lawyer here but my understanding is as long as you maintain the parts to put it back as registered you can run other uppers on your sbr lower.
 

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Post #3 correct, post #2 only if the change is permanent
Also not a lawyer but I can speak to personal experience. I have run multiple uppers for an SBR lower. You have to be able to put it back into original registered condition. So if you keep the original upper it was registered as, you should be good.

I imagine this also means you have to haul that original upper with you when you travel which is what I do.
 
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