AR15.Com Archives
 .270 AR?
WolfAmongSheep  [Member]
6/9/2006 7:39:41 PM
Would it be possible to build an AR (probably AR10) in .270? How practical would this be? More to the point, how expensive? I have a friend who wants to build one, but said he would prefer something a bit larger than .223, but still lighter than .308. Has anybody come across a conversion like this? What about mags? Thanks for any info that you can provide.
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rambo1937  [Member]
6/9/2006 8:54:38 PM
Go for a 7mm. LOL
rjay  [Member]
6/9/2006 9:40:50 PM
You can get AR10's in .260 Rem. You can get AR15's in 6.8 SPC which uses a .270 cal bullet.

rj
WolfAmongSheep  [Member]
6/9/2006 10:13:47 PM

Originally Posted By rambo1937:
Go for a 7mm. LOL



Actually, after doing some super digging, I did find a company who will do 7mm and 300 WSM's but the $2300 + price tag is a bit out of his league

accuracysystemsinc.com/ar10_supermagnum.html

ETA: Which is why he would like to build one...
AR15barrels  [Dealer]
6/10/2006 1:53:35 AM
The 270 winchester cartridge is too long for ANY AR-10 based rifles.
Those 7mm and 300 mags are remington short action ultra mags which are the same loaded length as a 308.
You can build an AR-10 in ANY of the 308 based cartridges, so 243, 260, 7-08 and 308.
If your friend is dead-set on having a 270 caliber, i could wildcat him a 270-08 by chambering with a 260 and then coming in with a 270 neck and throat reamer.
Of course your friend will need custom loading dies to reload for this.
7-08 and 260 ammo are available off the shelf.
WolfAmongSheep  [Member]
6/10/2006 2:59:56 PM

Originally Posted By AR15barrels:
The 270 winchester cartridge is too long for ANY AR-10 based rifles.
Those 7mm and 300 mags are remington short action ultra mags which are the same loaded length as a 308.
You can build an AR-10 in ANY of the 308 based cartridges, so 243, 260, 7-08 and 308.
If your friend is dead-set on having a 270 caliber, i could wildcat him a 270-08 by chambering with a 260 and then coming in with a 270 neck and throat reamer.
Of course your friend will need custom loading dies to reload for this.
7-08 and 260 ammo are available off the shelf.



Thanks for the info ARB. So basically, all he needs is the stripped lower, the parts for the innerds, and then a .308 upper with a .308 based barrel? Have you tried any of those short mags or wildcats that everybody seems to be liking? Should I just try and talk him into a 6.8? Do the 6.8's have their own mag, or do they just use the .308 mags? Know how many will fit in there?
AR15barrels  [Dealer]
6/10/2006 4:58:31 PM

Originally Posted By WolfAmongSheep:
Thanks for the info ARB. So basically, all he needs is the stripped lower, the parts for the innerds, and then a .308 upper with a .308 based barrel? Have you tried any of those short mags or wildcats that everybody seems to be liking? Should I just try and talk him into a 6.8? Do the 6.8's have their own mag, or do they just use the .308 mags? Know how many will fit in there?



I'm sure you should know this, but by the wording of your last post, I'm not so sure.
There are two VERY different action sizes we are talking about here.
AR-15's fit the 5.56 & 6.8 which are limited to 2.25" overall length.
AR-10's fit the 308 cartridge family which is more like 2.75" long. (I forget the exact length)
There is no 5.56 or 6.8 mags for an AR-10.
6.8 mags are available at several different capacities in the AR-15.
308 mags are available in 5/10/20 round capacity.
WolfAmongSheep  [Member]
6/10/2006 8:25:07 PM

Originally Posted By AR15barrels:

Originally Posted By WolfAmongSheep:
Thanks for the info ARB. So basically, all he needs is the stripped lower, the parts for the innerds, and then a .308 upper with a .308 based barrel? Have you tried any of those short mags or wildcats that everybody seems to be liking? Should I just try and talk him into a 6.8? Do the 6.8's have their own mag, or do they just use the .308 mags? Know how many will fit in there?



I'm sure you should know this, but by the wording of your last post, I'm not so sure.
There are two VERY different action sizes we are talking about here.
AR-15's fit the 5.56 & 6.8 which are limited to 2.25" overall length.
AR-10's fit the 308 cartridge family which is more like 2.75" long. (I forget the exact length)
There is no 5.56 or 6.8 mags for an AR-10.
6.8 mags are available at several different capacities in the AR-15.
308 mags are available in 5/10/20 round capacity.




Whoops! hehehe....that was a typo. Thanks for making sure though
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