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Ok, so an AR15 can be used to designate a .223, 5.56, Wilde, as well as some other calibers that use the same upper and lower receiver with a different bolt and barrel (like Blackout, 450 Bushmaster, etc) right?

 

What about AR10? Is it always .308 Win? Is there a difference between an AR10 and a .308, or is that just the way some companies label it?

 

(Less important question)

What about 9mm and .45? Those lowers have a magazine channel that is different (usually a Glock magazine?) so the lower is different, but the same upper (with a different bolt and barrel)? Is that still an AR15?

 

 

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Edited by srjdsmith

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The AR10 has a larger chambering capability than the AR15. Most of them are .308, however, they can be made in .243, .260, 22-250, 6.5 & 6mm creedmoor ect......

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Ok, so an AR15 can be used to designate a .223, 5.56, Wilde, as well as some other calibers that use the same upper and lower receiver with a different bolt and barrel (like Blackout, 450 Bushmaster, etc) right?

 

What about AR10? Is it always .308 Win? Is there a difference between an AR10 and a .308, or is that just the way some companies label it?

 

(Less important question)

What about 9mm and .45? Those lowers have a magazine channel that is different (usually a Glock magazine?) so the lower is different, but the same upper (with a different bolt and barrel)? Is that still an AR15?

 

 

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I have to point out that not all large caliber ARs use the AR-10 receivers. AR-10 type receivers are specific to Armalite, KAC, and a couple other companies. Others use larger AR-15 type receivers like RRA, PSA, S&W, and a few others. Armalite AR-10s are typically 7.62.51 (.308). Same for KAC and a couple others. The other large caliber receivers are typically used for .308WIN, 6.5 Creedmore, and a few others. The AR-10 receivers and the other large caliber receivers ARE NOT interchangeable.

 

As for the 9mm and .45ACP offerings, they use either a modified AR-15 platform lower receiver or a specific lower receiver designed just for the specific 9mm or .45ACP magazines. Upper receivers are generally the same as the AR-15 platform uppers. Barrels and BCGs will be different. These are still considered to be AR-15s since they are based on the AR-15 platform.

Edited by TackleberryMCS

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The AR10 has a larger chambering capability than the AR15. Most of them are .308, however, they can be made in .243, .260, 22-250, 6.5 & 6mm creedmoor ect......

So, is this an AR10 or something different? They don’t call it AR10, just .308

http://www.primaryarms.com/aero-precision-m5-308-stripped-upper-receiver-apar308503

 

 

Oops. Tack was posting as I was writing this. So, this upper is NOT an AR10?

 

What about the lower? AR15 lowers clearly won’t work. Seems like, once you leave AR15 behind, things get a little more ‘muddy’ and there’s less universality.

 

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Edited by srjdsmith

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So, is this an AR10 or something different? They don’t call it AR10, just .308

http://www.primaryarms.com/aero-precision-m5-308-stripped-upper-receiver-apar308503

 

 

Oops. Tack was posting as I was writing this. So, this upper is NOT an AR10?

 

What about the lower? AR15 lowers clearly won’t work. Seems like, once you leave AR15 behind, things get a little more ‘muddy’ and there’s less universality.

 

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The Aero Precision upper and lower are not the AR-10 platform. They are the larger caliber receivers based on the AR-15 receiver design.

 

Here are what AR-10 type receivers look like. Notice the angle at the rear of the receivers.

 

https://www.armalite.com/product/10002001-ar10-b-series-upper-receiver-assembly/

 

https://www.armalite.com/product/a10002001-ar10-a-series-upper-receiver-assembly/

 

https://www.armalite.com/product/l103gn-ar10-competition-complete-lower/

 

https://www.armalite.com/product/l10tac-ar10-tactical-complete-lower/

 

 

Here is a KAC SR-25 upper receiver assembly. Note the same angle as the Armalite AR-10.

 

https://www.knightarmco.com/14714/shop/rifle-partsaccessories/sr-25-upper-reciver-kit-pr-20-m-lok

 

 

You can see the fit on the KAC SR-25 in this pic.

 

https://www.knightarmco.com/12014/shop/commercial-firearms/sr-25-e2-cc-m-lok

 

 

Here is a S&W MP-10. Notice the curve at the rear of the upper as opposed to the angle on the AR-10 upper.

 

https://www.smith-wesson.com/firearms/mp-10-308-win-optic-ready

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I haven’t even shot my 450 Bushmaster yet. Maybe Friday.

 

Ok. So an AR10 (angled bottom on the upper and quite ‘triangular’ on the sides) is quite different than an ‘AR-308’ (which is radiused on the bottom of the upper and looks like an AR15 on steroids). Clearly the lower receivers are likewise different.

 

So, this says AR10,

 

https://americanmadetactical.com/product/80-lower-ar-10-billet-raw/

 

and this says AR10

 

https://americanmadetactical.com/product/ar-10-raw-upper-receiver/

 

But they are different than Armalite AR-10® even though some companies call them AR10? They are rounded at the bottom corner of the upper.

 

Is this a good way to build a .308? Or should it be the Armalite design?

 

Also, .308 Win & 7.62x51 aren’t like .223 and 5.56, right? That is: Can’t shoot 5.56 in a rifle chambered for .223, but can shoot .223 in a rifle chambered for 5.56. .223 Wilde also shoots both safely.

 

Whereas .308 Win, the ‘civilian’ round, is interchangeable with the 7.62x51 NATO, right?

 

 

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I havent even shot my 450 Bushmaster yet. Maybe Friday.

 

Ok. So an AR10 (angled bottom on the upper and quite triangular on the sides) is quite different than an AR-308 (which is radiused on the bottom of the upper and looks like an AR15 on steroids). Clearly the lower receivers are likewise different.

 

So, this says AR10,

 

https://americanmadetactical.com/product/80-lower-ar-10-billet-raw/

 

and this says AR10

 

https://americanmadetactical.com/product/ar-10-raw-upper-receiver/

 

But they are different than Armalite AR-10® even though some companies call them AR10? They are rounded at the bottom corner of the upper.

 

Is this a good way to build a .308? Or should it be the Armalite design?

 

Also, .308 Win & 7.62x51 arent like .223 and 5.56, right? That is: Cant shoot 5.56 in a rifle chambered for .223, but can shoot .223 in a rifle chambered for 5.56. .223 Wilde also shoots both safely.

 

Whereas .308 Win, the civilian round, is interchangeable with the 7.62x51 NATO, right?

 

 

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Its not advisable to shoot 556 through a 223 barrel. For 308/7.62 its the opposite. Its not good to shoot 308 in a 7.62 barrel.

 

Now im not aware of any negative incidents of someone shooting 556 through a 223 barrel...so take it with a grain of salt.

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I have to point out that not all large caliber ARs use the AR-10 receivers. AR-10 type receivers are specific to Armalite, KAC, and a couple other companies. Others use larger AR-15 type receivers like RRA, PSA, S&W, and a few others. Armalite AR-10s are typically 7.62.51 (.308). Same for KAC and a couple others. The other large caliber receivers are typically used for .308WIN, 6.5 Creedmore, and a few others. The AR-10 receivers and the other large caliber receivers ARE NOT interchangeable.

 

As for the 9mm and .45ACP offerings, they use either a modified AR-15 platform lower receiver or a specific lower receiver designed just for the specific 9mm or .45ACP magazines. Upper receivers are generally the same as the AR-15 platform uppers. Barrels and BCGs will be different. These are still considered to be AR-15s since they are based on the AR-15 platform.

Tac,

What are the specific differences between a true AR10 receiver and the others ?

 

I understand that a lot of companies are building the upper receiver to accommodate the larger cartridge, bolt, barrel, etc, and then forging the lower receiver so that it accepts

mil-spec AR15 furniture and triggers, with a magwell to accommodate the larger magazines.

 

To further the confusion, companies like POF are designing .308 caliber MSR's which they say are the same size as an AR15 except where it must accommodate a larger magazine and the.308 cartridge/barrel. I noticed you did not mention DPMS or DPMS II. I had the impression that DPMS had more AR10 type rifles out there than any other single company, and for a while I thought the push was on to standardize a design, and DPMS looked like the way things were headed.

 

DPMS II and the other companies cranking our "tweeners" seems to have killed off any hope od standaedazation.

 

In short, what's the difference between an AR 10 receiver these other rifles that seem to be stuffing 7,62 X 51 into a 5.56 sized reciever.

 

I was also curious as to your opinion re durability on these AR10 recievers on a diet to size and weigh in like an AR15. THey are alo removing metal from the bolt, etc to keep the AR10 on a diet. I don't see how these skinny .308's can be as durable as an AR10 sized reciver...

Thaanks,

John

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