AR-15 vs AR-10?

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AR-15 vs AR-10?

Post by Bonsoir » Mon Mar 16, 2015 9:12 am

I have had this nagging at the back of my mind for months now. I plan to build an AR platform rifle from an 80 percent lower reciever. My main question is whether i should get an AR-15 or an AR-10. I HATE the 5.56 round (for reasons i do not wish to explain here) and the 7.62 seems to be a much better round. However, i have seen AR-15 uppers in many calibers (50 BMG anyone?) But the AR-10 seems to only come in one caliber. So what do you guys think? (Also any tips on building from an 80 percent lower would be appreciated)

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Re: AR-15 vs AR-10?

Post by Neptune Glory » Mon Mar 16, 2015 9:19 am

With the limited research I've done so far, suggest looking into the S&W M&P 10.

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Re: AR-15 vs AR-10?

Post by ShooterMike » Mon Mar 16, 2015 9:29 am

Bonsoir wrote:...But the AR-10 seems to only come in one caliber...
This part is not true, just FYI. You can put together an AR10 in any of the calibers that are based on the .308 case head and length. So .243, .260, 7mm-08 or .338 Federal are all off-the-shelf options. You just have to obtain the barrel chambered on the caliber of your choice. The bolt and magazines will work fine with any of those listed, and probably quite a few I can't think of now.

Or another attractive option (at least to me) is an AR15 in 6.8 SPC.

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Re: AR-15 vs AR-10?

Post by Bonsoir » Mon Mar 16, 2015 4:54 pm

Thanks for the tips on AR-10 uppers, ShooterMike! I will have to look into that. Anyway, I know this is probably a little late to say this, but does anyone know of cheap (i.e. under $250) uppers? I am on a VERY tight budget.

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Re: AR-15 vs AR-10?

Post by ShooterMike » Mon Mar 16, 2015 7:25 pm

You mean like this?
http://palmettostatearmory.com/index.ph ... eiver.html

And this is so good I may even grab one.
http://palmettostatearmory.com/index.ph ... eiver.html

I personally think this is a pretty good deal too.
http://palmettostatearmory.com/index.ph ... andle.html

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Re: AR-15 vs AR-10?

Post by Stercutus » Mon Mar 16, 2015 8:41 pm

If I had to do over again I 'd just get an Ar-15 in 6.5 Grendel. You get the lighter AR-15 package and outstanding performance on par with 7.62X51. Of course when I bought my Ar-10s there was no such round available for the Ar-15. Today there is so... unless you want a heavier rifle for some reason...
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Re: AR-15 vs AR-10?

Post by absinthe beginner » Mon Mar 16, 2015 9:15 pm

Unless you plan on being a one-man band, if there's any scenario where you actually NEED to use your firearm for self-defense, commonality and of rounds and magazines, and interoperability of weapons, might factor more heavily into your calculations. In that case the two logical options would seem to be AR-15 or AK-47 pattern rifles, each of which has its own merits and shortcomings. Although I can see why going the 6.5mm route would be an attractive option in terms of superior range/stopping power.

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Re: AR-15 vs AR-10?

Post by joker52186 » Wed Mar 25, 2015 1:40 am

Ar10

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Re: AR-15 vs AR-10?

Post by JeeperCreeper » Wed Mar 25, 2015 4:30 am

80% Lower??? Standard AR15. It's more standardized and less room for error. There's also better templates and jigs I'm sure. There are plenty other options in 15 flavor than 5.56... you got 6.8, 300BLK, 450, 458, 50, etc etc etc
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Re: AR-15 vs AR-10?

Post by Dave_M » Wed Mar 25, 2015 9:39 am

7.62N ARs have never really been standardized so they aren't anywhere close to being as, 'plug and play' as a 5.56 AR. Quality and reliability is all across the board, and at this point there are only a few makes I would consider purchasing (and they ain't cheap).
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Re: AR-15 vs AR-10?

Post by Hollis » Wed Mar 25, 2015 9:46 am

JeeperCreeper wrote:80% Lower??? Standard AR15. It's more standardized and less room for error. There's also better templates and jigs I'm sure. There are plenty other options in 15 flavor than 5.56... you got 6.8, 300BLK, 450, 458, 50, etc etc etc

80% is a home brew kit, no paper work.


There are even more, 7.62 x 39, 6,5 Grendal (worth looking into), 9mm etc.

The more exotic the round the greater the cost and the harder to find.

AR10s is like the big brother to the AR15. Advantage is the .308 is not a exotic round. disadvantages as Dave_M says.

I have A Armalite AR-10, there are a bunch out there now. I have been thinning my heard and sold off my M1A1 (to a really good friend) and kept the AR-10.

AR-10 is heavier than the AR-15 and so is the ammo, that can mean carrying less ammo in case of a Bug Out situation where one is walking.
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Re: AR-15 vs AR-10?

Post by Doctorr Fabulous » Wed Mar 25, 2015 10:42 am

Three problem with the AR10 is that the ones I'd trust off the shelf are on par with a SCAR for money. I'm sure I'll end up playing with one at some point, and I'll be sure to share my frustrations. Just a sampler, look at the mag compatibility issue:


FN FAL metric magazines: 

Rock River LAR-8 
Bushmaster BAR-10 (discontinued)(inferred) 
Armalite AR-10B (modified) 
Kel-Tec RFB 
FN FAL (and copies) 
L1A1 (and copies) 

L1A1 magazines: 

Rock River LAR-8 
Bushmaster BAR-10 (discontinued) 
L1A1 (and copies) 
BREN .308" 

Thermold FAL: 

Rock River LAR-8 
Bushmaster BAR-10 (discontinued) 
FN SCAR-H (modified) 
L1A1 (and copies) 
BREN .308" (inferred) 
FN FAL (and copies) 
Kel-Tec RFB (inferred) 

Moses Mag metric: 

Rock River LAR-8 (modified) 
Bushmaster BAR-10 (discontinued)(modified)(inferred) 
Kel-Tec RFB (modified) 
FN FAL (and copies) 
L1A1 (and copies) 
SCAR-H (modified) 

Moses SCAR (to be released): 

FN SCAR-H 

Moses LAR-8 (to be released): 

Rock River LAR-8 
Bushmaster BAR-10 (discontinued)(inferred) 
FN SCAR-H (modified)(inferred) 
L1A1 (and copies)(inferred) 
BREN .308" (inferred) 
FN FAL (and copies)(modified)(inferred) 
Kel-Tec RFB (modified)(inferred) 

M-14: 

Armalite AR-10B (modified) 
M-14 
M-1A 
Mossberg MVP .308" 

AR-10B Type 1: 

Armalite AR-10B 
M-14 
M-1A 
Mossberg MVP .308"(inferred) 

AR-10B Gen 2: 

Armalite AR-10B 
Noveske N6 (discontinued) 
Aero Precision (discontinued) 

H&K G-3: 

H&K G3/91 (and copies) 
Cobb Mfg MCR-200 (discontinued) 
Bushmaster MRC (discontinued) 
CMMG (discontinued) 

FN SCAR-H: 

FN SCAR-H 

H&K 417: 

H&K 417 

Original AR-10 (waffle type, also Magpul, et al): 

Armalite AR-10 (original) 
Knight's SR-25 
DPMS (Gen 1 & 2) 
Bushmaster .308" ORC 
Armalite AR-10A 
Armalite AR-10B (modified) 
Mossberg MVP .308" 
Colt LE 901 
Handl Defense lower for the FN SCAR-H 
most other AR .308" platforms on the market 

Coypastad from arfcom. There's also different receiver dimensions, a few different bolt/bcg types, barrel nuts...blame Armalite, IMO.
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Re: AR-15 vs AR-10?

Post by Dabster » Wed Mar 25, 2015 10:48 am

I have a ridiculously heavy Armalite AR-10t. It is a bit ponderous but a joy to accurately shoot at longer ranges. I could see it being incredibly useful in certain situations. I also have a AR-15 with an 11.5 inch barrel that is extremely light and manageable (Almost concealable if you know what I mean), adequately accurate and very fast on target. I could also see it being useful in certain (Maybe more) situations.

One is a dainty little chisel and the other is a sledge hammer. They are both good at what they do and only so-so at what the other can do. The obvious answer to this question is both.
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Re: AR-15 vs AR-10?

Post by Dave_M » Wed Mar 25, 2015 11:20 am

Dabster wrote:I have a ridiculously heavy Armalite AR-10t. It is a bit ponderous but a joy to accurately shoot at longer ranges. I could see it being incredibly useful in certain situations. I also have a AR-15 with an 11.5 inch barrel that is extremely light and manageable (Almost concealable if you know what I mean), adequately accurate and very fast on target. I could also see it being useful in certain (Maybe more) situations.

One is a dainty little chisel and the other is a sledge hammer. They are both good at what they do and only so-so at what the other can do. The obvious answer to this question is both.
Or you know, an 11.5" 7.62N :rofl:

But seriously, with the right ammo I'd run a 13.5" or 14.7" 7.62N.
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Re: AR-15 vs AR-10?

Post by Dabster » Wed Mar 25, 2015 11:44 am

Dave_M wrote:
Dabster wrote:I have a ridiculously heavy Armalite AR-10t. It is a bit ponderous but a joy to accurately shoot at longer ranges. I could see it being incredibly useful in certain situations. I also have a AR-15 with an 11.5 inch barrel that is extremely light and manageable (Almost concealable if you know what I mean), adequately accurate and very fast on target. I could also see it being useful in certain (Maybe more) situations.

One is a dainty little chisel and the other is a sledge hammer. They are both good at what they do and only so-so at what the other can do. The obvious answer to this question is both.
Or you know, an 11.5" 7.62N :rofl:

But seriously, with the right ammo I'd run a 13.5" or 14.7" 7.62N.
I was sort of thinking those would come up... My first concern is that I think 7.62x51 loses a lot when the barrel is less than 16". Second, I'd be concerned that it seemed I was trying to compensate for something. :clownshoes:
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Re: AR-15 vs AR-10?

Post by Hollis » Wed Mar 25, 2015 1:22 pm

Dabster wrote:
I was sort of thinking those would come up... My first concern is that I think 7.62x51 loses a lot when the barrel is less than 16". Second, I'd be concerned that it seemed I was trying to compensate for something. :clownshoes:

Thanks for the chuckle (on compensaters--SP?). My thoughts are, no one single firearm does it all, there are pros and cons or compromises to what one gets.

Think of it as a encouragement to buy more guns. :)
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Re: AR-15 vs AR-10?

Post by JeeperCreeper » Wed Mar 25, 2015 5:57 pm

Hollis wrote:
JeeperCreeper wrote:80% Lower??? Standard AR15. It's more standardized and less room for error. There's also better templates and jigs I'm sure. There are plenty other options in 15 flavor than 5.56... you got 6.8, 300BLK, 450, 458, 50, etc etc etc

80% is a home brew kit, no paper work.
Yes, I am aware, I guess I wrote that oddly. What I meant is that since he's doing an 80% lower, its best in my opinion to go AR15 since it is more common and standard. Trying to use jigs and templates on a nonstandard AR10 lower may cause issues. But I have no experience, just a wild guess
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Re: AR-15 vs AR-10?

Post by LJ126 » Wed Mar 25, 2015 6:19 pm

For what it costs, if you want a .308 semi-auto, the AR-10 (whatever that means, they're all so different) probably isn't the right choice.
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Re: AR-15 vs AR-10?

Post by Hollis » Wed Mar 25, 2015 6:25 pm

JeeperCreeper wrote:
Yes, I am aware, I guess I wrote that oddly. What I meant is that since he's doing an 80% lower, its best in my opinion to go AR15 since it is more common and standard. Trying to use jigs and templates on a nonstandard AR10 lower may cause issues. But I have no experience, just a wild guess

IMHO, to do a single build it is a costy operation. Taps, drills, jigs, etc. Cool to do. I have built a number of my own firearms, fun to do, I avoided a AR build because cost to build just one.
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Re: AR-15 vs AR-10?

Post by Doctorr Fabulous » Wed Mar 25, 2015 9:49 pm

LJ126 wrote:For what it costs, if you want a .308 semi-auto, the AR-10 (whatever that means, they're all so different) probably isn't the right choice.
Why?
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Re: AR-15 vs AR-10?

Post by LJ126 » Wed Mar 25, 2015 11:18 pm

For precisely the reasons outlined. Reliability in most models is spotty, unless you spend quite a bit. There are reliable .308/7.62NATO rifles that are durable, have favorable shooting characteristics, long/proven military histories, and are more cost effective (for now) than a trustworthy "AR-10."

Sure would be nice to drop a week's pay and get a trustworthy .308 Armalite type rifle but for now, it's a gamble. I've got some positive experience with DPMS .308's, but some bad too.

From my (admittedly fairly limited) experience, a PTR-91 or M1A is a better choice than a comparably priced AR-10, at least as far as reliable function out of the box is concerned.
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Re: AR-15 vs AR-10?

Post by Dave_M » Thu Mar 26, 2015 1:06 am

For me, right now... The 7.62N AR that I want is only a couple hundo less than a SCAR-H. Which complicates,things considerably.
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Re: AR-15 vs AR-10?

Post by Hollis » Thu Mar 26, 2015 3:47 am

LJ126 wrote:For precisely the reasons outlined. Reliability in most models is spotty, unless you spend quite a bit. There are reliable .308/7.62NATO rifles that are durable, have favorable shooting characteristics, long/proven military histories, and are more cost effective (for now) than a trustworthy "AR-10."

Sure would be nice to drop a week's pay and get a trustworthy .308 Armalite type rifle but for now, it's a gamble. I've got some positive experience with DPMS .308's, but some bad too.

From my (admittedly fairly limited) experience, a PTR-91 or M1A is a better choice than a comparably priced AR-10, at least as far as reliable function out of the box is concerned.
Not sure which ones you are talking about. I have been happy with my AR-10.

I also had 2 G3s, I have a L1A1 and sold my M1A1 to a friend. There are some choices/alternatives out there. I am a big fan of the M1A1, the M14 was one of my T/Oed weapons.
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Re: AR-15 vs AR-10?

Post by Rugger » Thu Mar 26, 2015 3:35 pm

Dave_M wrote:For me, right now... The 7.62N AR that I want is only a couple hundo less than a SCAR-H. Which complicates,things considerably.
What are you looking at? What are the AR-.308s you consider reliable enough to trust? I'm sure most folks on here would value your opinion, given your areas of expertise and rifles you see running through classes.
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