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Old 04-24-2016, 02:45 PM   #1
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10 inch AR-15

Has anybody have any experience with an AR-15 with this short a barrel? I have to believe both accuracy and velocity would suffer. I know the CAR-15's with short barrel were notoriously inaccurate and malfunctioned a lot. They looked Cool, though.
 
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Old 04-24-2016, 03:20 PM   #2
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My only experience-many years in the past- led me to the conclusion that the gas system gets a bit overwhelmed .Heats up fast.They ARE a lot better now, simply because there's been so many competing SBR development; there HAD to have been progress regarding function. I still consider heavier bullets/bigger bore to be my preference in a 10 inch barrel. There ARE better 5.56 loadings available though
 
Old 04-24-2016, 03:25 PM   #3
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I DO wonder about something though: how does the 6.8 SPC do in its current loadings out of a 10.5 inch barreled upper? I was curious, because the VEPR is now available in 6.5 Grendel... Not the same thing, obviously; but I was thinking a comparatively straight walled case like the 6.8 as an optional SBR upper-OR a dedicated stand alone SBR-might be worth consideration.
 
 
Old 04-24-2016, 04:26 PM   #4
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Sorry, I have a 14.5" & 16" barrels on my AR15
 
Old 04-24-2016, 04:26 PM   #5
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not to me. The 223 does fine and I certainly aint giving up the military rd and the .22 unit. The heavier bullets just mean even less velocity in the short barrel, ie, less effective range
 
Old 04-24-2016, 05:29 PM   #6
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I had a 10.5" a long time ago, & sold it at a ridiculous price during the 94-04 awb. Blast was definitely worse than my 16 and 14.5 inch guns, but with the permanent flash-hider, wasn't as much worse as I would have thought. It was definitely worse, but I shoot rifles outdoors exclusively and in those open spaces it was mainly directed away from the shooter. If used indoors, it would be horrific if used without a good suppressor.

I never chrono'ed anything from it that I recall, but ballistics by the inch shows how much that type of round depends on barrel to do its job. Numbers for typical 55-grain UMC fmj stuff:

16" - 2963 fps, 1059 ft/lbs
14" - 2878 fps, 1011 ft/lbs
12" - 2724 fps, 906 ft/lbs
10" - 2616 fps, 836 ft/lbs

http://ballisticsbytheinch.com/223rifle.html

Basically iirc, a 20" gun gives at 150-175 yards or so what a 10" or 10.5" gun gives at the muzzle. So figure we cut 150-175 yards off the .223's capability from such a short barrel - not as good as a full-size gun, but still plenty adequate; especially for short-range defensive use. I'd trust my 16" guns out to 300 yards or so, and my 20" heavy gun out to past 400; so basically that (to me) makes a 10" gun in the same caliber good for 200 yards or so, give or take.

That said, I like the 16" primarily for ease of keeping it reliable with various loads. The pistol-length DI AR action is pretty finicky, and the sweet spot between under-gassed and over-driving the BCG is pretty narrow. My 16" guns, I can run heavy 5.56 loads, light PMC Bronze stuff and spiky-pressure-curve wolf steel stuff with equal aplomb. With a pistol-length action, that's likely to be not as easily achieved.
 
Old 04-24-2016, 05:37 PM   #7
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I use the 7.62x39 in a10.5 inch barreled AK pistol. I have nothing against the 5.56( or the 5.45 for that matter). I just consider the majority of loadings available in both calibers better suited to a 14.5-20 inch barrel. Seeing as the AK pistols in 7.62x39 give up less at the muzzle-and launch a heavier bullet- and that MOST (but not all AR's ) do better with a less tapered cartridge geometry; I was thinking the 6.8 might be a good upper ..and unlike the Grendel( which I like a lot-oooh I want that VEPR!) I believe (but could be wrong) the 6.8 can be run on the same bolt,or at least with a minmal parts swap on a 5.56lower.
Just burning some brain cells and synaptic gaps wondering.
 
Old 04-24-2016, 05:51 PM   #8
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the further away they are, the less you need an instantaneous stop. I couldn't care less if a guy flops around for a minute at 400 yds, before expiring from a hit from my 10" 223. I couldnt care less that a sp wouldn't expand beyond 200 yds, fired from a 10" barrel. I'll settle for "only" hitting him at 400 yds as hard as .45 ball hits him at 10 ft. He can't do anything to me from 400 yds, with a lethal hit in him. With a poor hit from a 308 ball rd, he might do all kinds of things, too.

it's far, far more important to me that the gun be HANDY with a (truly effective) silencer on it, and also be concealable, at least when taken down and in your pack. how many rides do you think you'll get, being seen to be hitching with a slung rifle? :-) how many times will you be ignored, vs all the twits that are in view and don't have a rifle?
 
Old 05-25-2016, 11:30 PM   #9
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I personally prefer 12.5" because it's just past the burn and pressure curves of general issue ammo. They shoot a lot closer to 14.5" than they do 10.5"

10.5s are well proliferated and understood now. There aren't really issues anymore. Mk18 clones are all over the place.
 
Old 05-25-2016, 11:33 PM   #10
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Consistency will always be better with shorter and fatter barrels on behalf of elastic deformation caused by being on planet earth.

Accuracy is all you if you have consistently tight capabilities.
 
Old 05-26-2016, 05:22 AM   #11
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the reality is that over 90% of the non-accidental hits made in rifle combat occur at less than 100m, that most hits ARE random accidents, that most hits are poor hits, and it takes many 1000's of rds to get each hit. Which is why .30 and 7mm bores will never come back as GI rds, by any military. It's just wasted effort to haul such rds into the combat zone. Less than 10% of battlefield casulaties are caused by rifle bullets.
 
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