AR-style (AR10 type) makes more sense in full power round than intermediate power?

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I.E. AR10 types make a lot more sense than AR15 types - *Particularly* for civilians without full autos but really for semi- or full-auto as well.

Bear with me please on this.

One of the main design features of the original Stoner AR10 and it's progeny (M16, AR15), if not THE MAIN feature of the design is this - the *tradeoff* between a higher sight plane (detriment), in order to gain the advantage of the straight-back recoil (with the straight buffer tube design), which minimizes muzzle climb and allows one to stay on target in full-auto mode (and nowadays, in burst mode). This works great in full-auto for an intermediate cartridge such as 5.56x45mm. But in semi-auto mode, which is what the vast majority of us citizens experience with AR types, this is not really needed at all - the 5.56x45 is such a pussycat that very fast semi-auto follow-up shots are cinch (especially with a good muzzle brake). And so for people like me, who greatly value the aspect of having one's optic as LOW as possible in order to have dead on accurate shots at very SHORT ranges, the sky high line of sight of an AR rifle is very irritating. I'd personally rather go ideally with something without the buffer tube, so as to get that line of sight within 1.5 or 1.75" of the barrel, for maximum range of point 'n' click accuracy. Which is one reason I'm getting an Robinson XCR (unlike most people, this particular factor is a far bigger factor than the supposed unreliability of the dready dirty AR in deciding to get a non-AR15 over an AR15).

Now, 7.62x51mm, OTOH, is generally considered uncontrollable in full auto pretty much whatever you do to the rifle (other than making it weigh 18+ lbs), not to mention the other reasons for the military not adopting a "full-powered" round for the average soldier to carry in his/her select-fire, standard issue rifle. For whatever reason, the AR10 or SR25 type is not the chosen issue of the .mil. Nor are AR10 types popular among registered machine gun owners in the USA (I don't think there's many of them at all). But for civilians shooting semi-auto in 7.62x51/.308 win, a full-powered round, getting back on target quickly is much harder to do given the recoil/muzzle climb of that round. Accurate double taps just ain't that easy to do. But with the straight back buffer tube design in .308, getting on target for the 2nd shot is bound to be much easier than with substitutes like M14 types, FALs, AK types, etc. This in turn makes the sky high optic line "worth it" in terms of the tradeoff, especially in light of the more long-range nature of the full-powered round like the 7.62x51 (or other chamberings which AR10 types make come in, such as .260 rem or .243 win). *IFF* one has a need for quick follow up shots on the same target, that is. Whereas hunters usually don't. So it's more of a fighting rifle concept. The bottom line being: IF you like the AR ergos, and IF you think you need a "full-powered" round for fighting, and IF you'll need quick double taps, then the AR10 type offers a distinct advantage over other possible rifles in this category, making what normally is quite obnoxious to me (the super high sight line) worth it as a tradeoff.

In fact, a case could be made for civilians that, if limited to semi-auto, and not having to hump all your gear & ammo across long distances as a soldier would, something like an AR10 in .243 win is the ultimate fighting rifle. Super fast and accurate double taps could be made for this setup, along with great terminal effectiveness.

Am I making sense or smokin weed here?
 
6.8 SPC.


Personally, I'd like to have an AR-10 chambered for .358 Winchester. That will keep their heads down; permanently if you score a hit.
 
I argee 100%.

I want one in a carbine for CQB, and one in a SASS or SR25 configuration for long distance detail work.

probably go with the long range rifle first.
 
And so for people like me, who greatly value the aspect of having one's optic as LOW as possible in order to have dead on accurate shots at very SHORT ranges, the sky high line of sight of an AR rifle is very irritating.

It sounds like for you, the tall optics make short range shooting more difficult than you think it should be. I don't see how this problem (tall optics and short ranges) will be fixed by any change in caliber.
 
No, true enough - it won't, but it *might* make the tradeoff worth it in the larger caliber. As always, it's all about the tradeoff(s) involved. Having said that, if you like muzzle brakes (which I don't), then the tradeoff is probably still NOT worth it, since it's quite easy to get back on target with a good brake. Hello M14 or FAL or G3 or AK type.

For a 5.56x45 poodle shooter, the AR15 platform just doesn't make a lot of sense if you're shooting short range a lot. I hate hitting 3" or more low inside 25 yards, which is necessary for that platform, with a dead-on aim. I like precision, and shoot accurate rifles, and aim precisely. If I can hit plus or minus 1" to 1.5" out to 50 yards on a good day, I hate it that my GUN makes me 3 or more inches off at very close range, unless I'm bothered to actually engage my brain and adjust my aim, but that is anti-thetical to stressful "fighting" situations and thus training for same (thinking, that is).

Bottom line, as always, choose the right tool for the job - an intermediate-caliber rifle with a low optical line (such an the XCR) for "all purpose" and close-in fighting, and a full-power AR10 style for hunting or long-range fighting. Seems to me...

Full auto and burst fire would be a whole different story, which is why I like and agree with the U.S. Military's doctrine & choices in this area (for the most part). Anyway, that's my two cents...
 
And so for people like me, who greatly value the aspect of having one's optic as LOW as possible in order to have dead on accurate shots at very SHORT ranges, the sky high line of sight of an AR rifle is very irritating.

Isn't that the problem the "A3" flat top uppers are supposed to solve? Don't see how the caliber matters much for this issue.

I've an DPMS LR-308 and its a nice shooter but I shoot the AR or AK much more often due to ammo costs -- especially for 25-75 yard plinking at two liter plastic bottles. I love it if you hit right at the bottom and the dirt kicks em 20-50' up into the air and about 10 yards further down range. Fun followup to launch them again as soon as they stop moving.
 
Height over bore simply isn't that big a deal, except when punching holes in paper at seven meters.

If it is that big a deal, just put an AimPoint or EOTech on the gun and zero it at ten meters or something, though I can't see any real utility in doing so.
 
I can't offer an unbiased opinion, because eye heart AR-10. :)
Anyway, in my opinion, 5.56mm should be left for lighter work and closer engagements. For tough nuts and farther-off targets, I'd imagine something with a little more buck would be good.
I like AR-15s too, but I want to test out a bunch of .223/5.56mm rifles. Like AUG clones, the ACR, the XCR, etc.

Wouldn't it be great if someone made an AR in.30-06? Come to that, aside from that oneshot from Cobb, how come no one does?
 
Interesting work. It does make sense if you limit yourself to .308/7.62 NATO ammo. Where I see some deviation in your essay is technology. Knight's Armament is developing a new PDW (Personal Defense Weapon) in 6 X 35 mm. In addition if you consider things like the 6.5 Grendel and the new 6.8 SPC ARs then problems associated with the .308 AR-10s fade into the distance. In addition, as time passes, more and more technology will be developed to offset the disadvantages associated with the heavier and bigger AR-10 rifles with calibers and millimeters between the .308 and the .223/5.56 cartridges. Time will tell.
 
Crunker: Cobb Manufacturing built an AR in .30-06 to celebrate the 100th anniversary of the cartridge. It's a tough cookie to find and it's expensive, but would make an awesome rig IMO.

As for the high sight lines thing, I have noticed that ARs seem to naturally shoot better at 100yds vs 25yrs because of that
 
The bottom line being: IF you like the AR ergos, and IF you think you need a "full-powered" round for fighting, and IF you'll need quick double taps, then the AR10 type offers a distinct advantage over other possible rifles in this category, making what normally is quite obnoxious to me (the super high sight line) worth it as a tradeoff.


What do you need doubletaps for with a .308? Hippos?
:p
 
I'm a bit confused about the sky-high sight line you refer to. With a flat-top AR, your optics are right around where they would be on most bolt guns, and that can be adjusted/compensated for anyway. Are you using iron sights?
 
What do you need doubletaps for with a .308? Hippos?

Exactly :D

I guess if you were running in the opposite direction it could be a little hard. Hippos I mean:neener:
 
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