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Firearm & Gun Forum - > Long Guns > Auto & Semi-Auto Discussion > AR-15 Discussion >

Multi cal lower?

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Old 03-26-2013, 07:52 PM   #1
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Default Multi cal lower?

If you get a multi cal lower, can you change the upper and use like 5.56 and a .308? or are the lowers completely different?

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Old 03-26-2013, 08:05 PM   #2
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The lowers for 5.56 (AR 15) and .308 (AR10), are different sizes. You cannot put a .308 upper on a 5.56 lower, or vice versa. You can however build a 7.62x39, 5.45x39, 9mm, 300Blk, 6.5, 6.8, 22lr, and some others with the ar15 lower, hence the multi Cal stamp.
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Old 03-26-2013, 08:12 PM   #3
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Ar-10 is .22-250, .243, .308 and some others I can't name off the top of my head
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