CapnMac
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Currently (historically it would be a different value) 3/4, or 75%. The current outlier being the M&P 15-22 in 22lr
AR-15's what percentage of yours are in chambered in 223/556
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James Fonteneaux
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Not going into numbers, a 450B, 6.8spc, 350 L, some 300 and some 5.56. And a 22 lr conversion kit.
Buzznrose
Member
Most of mine are 5.56 and I have .22 conversions for them.
I also have 7.62*39 and looking hard at both 300BO and 6.5 Grendel
I also have 7.62*39 and looking hard at both 300BO and 6.5 Grendel
citizenconn
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How do you like the 6x45? Does it require any special tweaking? Which bolt/magazine pattern does it use? Thanks in advance.
shoobe01
Member
Hard for me to answer as I have many more uppers than lowers.
Okay, only two (AR15... many other guns!) lowers, but the NFA one hosts [counts] four ... I think four, uppers. A couple 9s, a .300, and a 5.56. Some day, may get more as it's easy, just clip on and go.
Okay, only two (AR15... many other guns!) lowers, but the NFA one hosts [counts] four ... I think four, uppers. A couple 9s, a .300, and a 5.56. Some day, may get more as it's easy, just clip on and go.
Robbins290
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90%, All but 3 are chambered in 5.56. 2 are 762x39 and one will be 300 blackout
someguy2800
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2 out of 9
theotherwaldo
Member
Yep.
All of those cartridges are compromises that would probably not exist if they weren't forced into what the AR platform could handle. Unless the AR's components are seriously modified, reliability goes down quite a bit.
Also, most of those rounds do not and can not meet their full potential in a simple AR conversion unless the goal is to reduce the power and velocity of the round for use with a silencer or to keep sound or velocity down.
There are other, more powerful or more useful cartridges in .224, 6mm, 6.8, .300, .350, .458, etc. that aren't limited to the dimensions and weakness of the AR design.
They are used in firearms that were specifically designed to use them.
That sounds like a better idea to mr.
N555
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The one true caliber and the one true operating system.
Demi-human
maybe likes firearms a little bit…
citizenconn
Member
Opinions vary.
FL-NC
Member
1 in 308, the rest in 223.
theotherwaldo
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-If it's in .308, it's not an AR-15... .
OP
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mcb
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On one hand I agree all those cartridge's are compromised in the sense the cartridge was designed for the AR rather than the rifle designed for the cartridge but that is true for a lot of rifles and cartridge's. The AR has simply taken the to a fairly extreme level given the number of catridges designed specifically for the platform after the plateform was well established.
Its hard to beat the ergonomics of the AR-15 platform and thus IMHO I willing to compromise a little on the ballistic to get the AR-15 platform. ie the 450 Bushmaster falls short of the 45/70 in raw muzzle energy but I would take my 450 Bushmaster AR-15 over a 45/70 lever-action any day of the week and twice on bear day.
I really like the AR-15 platform but I currently don't have much use for 223/556 hence most of my AR-15 are chambered in cartridge other than 223/556. I hunt deer with 450 Bushmaster and 30 RAR and whack the armadillo (and hopefully some coyotes) with the suppressed 300 BO.
earlthegoat2
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I only have one lower receiver and it has the 5.56/.223 upper on it 98% of the time.
I also have 350L and 450BM uppers for hunting.
I also have 350L and 450BM uppers for hunting.
citizenconn
Member
Well he didn't say .308 Win, so he could have been talking projectile diameter. I've got several AR-15 chamberings that take .308 bullets, as long as we are being pedantic.
It has been a long time since I built the rifle but I do not remember doing anything special. I used a standard 223 bolt and buffer and it uses standard 223 magazines.
Velocities are kind of lackluster due to heavier bullets and a small case. It groups well but I have not really optomized the accuracy yet. Effective range is limited.
I am familiar with a couple of those. The 450 Bushmaster will not feed from a magazine with more than five rounds. The 458 SOCOM will as it was designed with enough taper to feed from magazines. And neither of these rounds are particularly impressive. How much better are they compared to a 44 Magnum from a lever action?, probably a similar rainbow trajectory making them short range things at best. What I have seen for the 300 BLK is a lesser round compared to a 30-30. .300 Blackout pushes a125 grain projectile at 2,220 FPS, I am doing that with a 170 grain bullet in a 30-30 lever action around 35 Kpsia. I am not familiar with the rest, maybe they are flash in the pans, so to say.
A good test of staying power will be in 20 years. If brass for any of those rounds is still being produced, then the round could be considered a success. In the decades I have been reading about the latest and greatest rounds, almost all of the hundreds, if not thousands, that have been introduced, and you can't find brass or ammunition. I just remembered the 307 Winchester, another end of history cartridge. Click on the link and see if you can order a box. I am confident brass for the 223 Rem will continue to be produced for the next 50 years, along with the 30-06 and 308 Win.
citizenconn
Member
Good idea, Uncle!
Charlie98
Member
Every time I go to build one, thinking about something different... I always circle back around to 5.56mm. Cheap. Reliable. Not proprietary. How can I say no?
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