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Posted: 1/24/2010 1:57:00 PM EDT
Quick question about my M&P15....The receiver I have is not marked as far as caliber...So I wondering if its able to be used with other calibers other than .223/5.56? (of course a new upper would be needed)
Also I am in Commifornia if that matters 
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Posted: 1/24/2010 2:04:32 PM EDT
[#1]
As far as federal regulations are concerned, you can use any caliber that works with your lower on an AR. The regulation requires the maker to mark the gun with a caliber-all the MP15s I've seen have "CAL 5.56MM" marked on the lower above the trigger pin. In any case, that marking is moot; there's no federal regulation requiring the user to keep to the caliber marked on an AR lower.
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Posted: 1/24/2010 2:08:20 PM EDT
[#2]
here a pic to sorta clear things....
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Posted: 1/24/2010 2:10:39 PM EDT
[#3]
Quoted:
As far as federal regulations are concerned, you can use any caliber that works with your lower on an AR. The regulation requires the maker to mark the gun with a caliber-all the MP15s I've seen have "CAL 5.56MM" marked on the lower above the trigger pin. In any case, that marking is moot; there's no federal regulation requiring the user to keep to the caliber marked on an AR lower. I'd have to go pull it out of the safe, but I'm pretty sure that I have an M&P that's marked CAL "5.45 X 39" but I'm not positive. I also think I've seen other receivers (various manufacturers) marked in 7.62 X 39 as well as 6.8 SPC and possibly .50 BEO on the Beowulf complete rifles. |
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Posted: 1/24/2010 2:17:33 PM EDT
[#4]
I bought a S&W lower at the fun show, was born just as a lower, not off a rifle..... it has no caliber markings on it either
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Posted: 1/24/2010 2:29:21 PM EDT
[#5]
I have 5 S&W ARs, not polymer 22LR models, and 1 of them, the oldest, is marked 5.56mm on the lower receiver. The rest are devoid of caliber marking.
The one that is marked 5.56, is from the initial production of S&W M&P-15s that were produced by Stag Arms under contract for S&W. |
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