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Discussion Starter #1
Neighbor wants me to help him build an ar10 in .308. I'm very familiar with ar15 but not a clue on the other. Does the ar15 lower fit 10 uppers. What is compatible an what's not? And finally, who has things like the bolt, bolt carrier, barrel, upper receiver and the like? And also are they even gas impingement systems?
 

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From my understanding all AR10 equipment is specific and not interchangeable with a AR15. Talk him into a AR15 300BLK.
 

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From my understanding all AR10 equipment is specific and not interchangeable with a AR15. Talk him into a AR15 300BLK.
There is no comparison here. The .300 BLK doesn't come anywhere near even being close to the 7.62X51

Two entirely different classes of rifle.
 

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locutus said:
There is no comparison here. The .300 BLK doesn't come anywhere near even being close to the 7.62X51

Two entirely different classes of rifle.
I know that but it is a great round. It will work for hunting very well in deer sized animals. Just a thought.
 

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well, the parts all look the same but no. you can NOT use any ar15 parts for the ar10. also ive been told that ar10 parts are lots more picky when it comes to parts that work good together.
 

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The parts between the AR-15 and AR-10 are not interchangeable.

It's sort of like a handgun in 9mm vs 45acp. Everything pretty well functions the same (to my knowledge), but the parts are sized up for the larger caliber. So you're dealing with a different fit when it comes to the upper, lower, BCG, etc. No interchangeability, except for maybe a few of the oddball smaller parts.

And most of the 7.62 stuff costs about 50% more than the 5.56.

But a well-built AR-10 can be hella accurate for up to 1000yds...in the hands of someone with far more skill than I.
 

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not only do ar15 parts and ar10 parts not go together...there are two non-compatible ar10 formats as well (DPMS and Armalite). Your best bet is to buy a complete rifle or really think about what components you want and stick to either the DPMS format or the Armalite format.
 

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Lol. Everyone is wrong and right at the same time.
 

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The problem with the ar10 platform is that there are a few different standards and parts are not interchangeable between the vrious types. Some ar15 parts are interchangeable with ar10 but not all. There are different magazines recievers etc. If your going to build one, be sure to research compatibility of components thoroughly.
 

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One other thing, but it's expensive.

Colt now offers the LE901 in .308 (7.62X51)

This lower will accept a Colt 5.56X45 AR-15 upper, so you can have both uppers on one lower.

It's a solution to the problem, but it is mighty expensive, and AFAIK, it's only available as complete units, bot parts.

(I might be mistaken on that one, but that is my understanding)
 

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Discussion Starter #12
locutus said:
One other thing, but it's expensive.

Colt now offers the LE901 in .308 (7.62X51)

This lower will accept a Colt 5.56X45 AR-15 upper, so you can have both uppers on one lower.

It's a solution to the problem, but it is mighty expensive, and AFAIK, it's only available as complete units, bot parts.

(I might be mistaken on that one, but that is my understanding)
So if the lower will accept a 5.56 upper, wouldn't it accept all 5.56 uppers?
 

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Specs

Special Features

1-Piece Upper Receiver with Back Up Iron Sights (BUIS)
Full Floated Barrel
Bayonet Lug and Flash Hider
Ambidextrous Controls
Accepts Mil-Spec 5.56 Colt Uppers

I would say it accepts the normal mil spec AR upper of most any brand .

This pic explains more how it works than any I have found , it uses the adapter to make the smaller upper work which also makes use for your smaller 5.56 mags

 

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not only do ar15 parts and ar10 parts not go together...there are two non-compatible ar10 formats as well (DPMS and Armalite). Your best bet is to buy a complete rifle or really think about what components you want and stick to either the DPMS format or the Armalite format.
Very true though I wouldn't refer to the "DPMS" standard, it's the original ArmaLite AR-10, Stoner or Knight's Armament SR-25 format. Magpul of course makes PMAGs for this format. DPMS came to the party much later. RRA uses a third format that uses FAL mags.

But things may be improving, as of early this year ArmaLite has returned to the original AR-10 magazine/upper format with their AR-10A. (Their AR-10B of course uses the M14 style mags.) I think we're beginning to see a standard forming around the SR-25/AR-10A and of course our military has a contract with KAC.
 
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