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Old 02-06-2011, 04:44 PM   #1
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Default Large caliber options for Ar-15 upper? Looks like .223 round is max

I do not own an AR but recently stole a friends to inspect for a possible big bore whisper rifle build. I want to run about a .500 round in this build. It became obvious after inspection of the AR platform that they were designed for the 5.56 and the .223 only. The action will handle a bit more length but the mags are maxed out with a .223 round.

I am just curious what uppers are out there for bigger rounds and if any or all of them are somehow feeding through the mag or are single shot systems? Would have to have a different mag, etc to feed through the mag I would think.

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Old 02-06-2011, 04:51 PM   #2
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How about a .50 Cal BMG upper?

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Old 02-06-2011, 05:01 PM   #3
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Try a .50 Beowulf, .458 SOCOM, .450 Bushmaster, .300 AAC BLK, .300 Whisper and multiple other calibers. That's just the ones I was looking at before I finally settled on...STAY TUNED.

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Old 02-06-2011, 05:15 PM   #4
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I am looking for a round that specifically feeds in a clip in the AR. I know the .50 BMG is a single shot only. I also want to sling over 500gr and ran some numbers and I can really only load up a Beowulf with solid lead to about 550gr. A jacketed would weight much less.

Just really need an upper and clip that can handle more length. Is that possible?

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Old 02-06-2011, 05:18 PM   #5
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How about a sub-sonic AR-45?



My 458SOCOM hog getter named MAGNUM P. I. G



458 SOCOM Ammunition





Rock River Arms: .458 SOCOM CAR A4 Upper Half

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Old 02-06-2011, 05:54 PM   #6
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Can you get a 500-700gr slug for the Beo that wil actually fit in the AR clip? Does anyone make another upper design with longer length capacity or is there only really one platform for the AR?

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Old 02-06-2011, 08:24 PM   #7
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Why? whats the reason behind wanting a 700 grain bullet comming out of a AR bbl? you want a longer round you need to look at the ar10 the big brother but I think you are asking a little too much, all this lets stick a 105 round in a AR is getting to be ridiculas.

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Old 02-06-2011, 09:03 PM   #8
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Correct me if I am wrong, but if you want to use magazines to feed the larger rounds, don't you have to have the receiver for the round as well? Like with the .308?

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Old 02-06-2011, 09:14 PM   #9
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The COL will determine if it fits in the magazine, if you want to use rounds such as something that has a COL of the 308 then you need the AR10.
What they are are forgetting is magazine capacity, these larger rounds really eat the space in a mag and if they want hi capicity they aren't going to get it within reason.

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Old 02-06-2011, 10:16 PM   #10
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510 grains is about as heavy as you want to go in a 458 caliber barrel. personally i think anything over 350 grains in the 458 socom is a waste of lead. there is a practical upper limit. if i really need big bore hitting power 458winmag or 458lott are my gotos

subsonic, your better off with 45acp.

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