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Can 556 AR accept some kind of 308/762 drop-in upper? (Read 7158 times)

passivekinetic

Can 556 AR accept some kind of 308/762 drop-in upper?
« on: March 10, 2016, 12:26:03 PM »
Guys, can a 223/556 AR lower accept some kind of 308/762 drop-in upper?

Is there such a thing?

Change upper and change mags, and good to go?
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Jphilly

Re: Can 556 AR accept some kind of 308/762 drop-in upper?
« Reply #1 on: March 10, 2016, 12:30:37 PM »
Nope needs a larger mag well, closest you'll get is like 300 blk or 6.8 Spc
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B.A. Baracus

Re: Can 556 AR accept some kind of 308/762 drop-in upper?
« Reply #2 on: March 10, 2016, 01:10:27 PM »
Also 7.62 X 39  (AK round)
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Shots69

Re: Can 556 AR accept some kind of 308/762 drop-in upper?
« Reply #3 on: March 10, 2016, 01:29:24 PM »
Single shot 50bmg upper can...
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passivekinetic

Re: Can 556 AR accept some kind of 308/762 drop-in upper?
« Reply #4 on: March 10, 2016, 01:40:38 PM »
ok thanks guys
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ren

Re: Can 556 AR accept some kind of 308/762 drop-in upper?
« Reply #5 on: March 10, 2016, 02:12:59 PM »
Quote from: Shots69 on March 10, 2016, 01:29:24 PM
Single shot 50bmg upper can...

he said: Guys, can a 223/556 AR lower accept some kind of 308/762 drop-in upper?
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Shots69

Re: Can 556 AR accept some kind of 308/762 drop-in upper?
« Reply #6 on: March 10, 2016, 02:31:50 PM »
Quote from: ren on March 10, 2016, 02:12:59 PM
he said: Guys, can a 223/556 AR lower accept some kind of 308/762 drop-in upper?
Yeah i know... But the previous replies already covered that being a definite no. So i covered the other other option!
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dafrtknocker

Re: Can 556 AR accept some kind of 308/762 drop-in upper?
« Reply #7 on: March 10, 2016, 07:34:26 PM »
Colt makes a 308 lower that takes 556 upper. Not sure if the kit is sold yet.
http://www.colt.com/Catalog/LawEnforcement/Products/ColtModularCarbine.aspx#99631-overview

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Jl808

Re: Can 556 AR accept some kind of 308/762 drop-in upper?
« Reply #8 on: March 10, 2016, 11:02:33 PM »
Look for an AR-10. Or an AR-308
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passivekinetic

Re: Can 556 AR accept some kind of 308/762 drop-in upper?
« Reply #9 on: March 11, 2016, 10:05:02 AM »
Yeah ok thanks guys. I know AR-10 but if there was an upper option, it means no "hassle" again with yet another lower.
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"The sheep fear sheepdogs, because they fail to see the wolves."
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Jl808

Re: Can 556 AR accept some kind of 308/762 drop-in upper?
« Reply #10 on: March 11, 2016, 01:41:17 PM »
The magwell size is much bigger for the AR-10.  Unfortunately, you'll need a new lower too.
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SpeedTek

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Re: Can 556 AR accept some kind of 308/762 drop-in upper?
« Reply #11 on: March 11, 2016, 04:58:23 PM »
Colt has a convertible out.   It uses an adapter magwell for the 308.   There are bolt action uppers available for the 556 lower.  But they are single shot.  Just buy a AR308 based on DPMS Pattern. There are a lot of parts available compared to Armalite AR10's.  All the good barrels made are all AR308.  To make one for the AR10 you end up making custom barrels. 
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