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fa35jsf 04-28-2014 10:29 PM

308 ar-15?
Quick question, if I wanted to build my next AR-15 and chamber it in 308, is that possible? I know that AR-10 is chambered in 308 but those are heavy.

robocop10mm 04-28-2014 10:34 PM

The AR-15 will not take a cartridge as long as the .308. AR-10 is the only option

fa35jsf 04-28-2014 10:36 PM


Originally Posted by robocop10mm (Post 1567189)
The AR-15 will not take a cartridge as long as the .308. AR-10 is the only option

Ok. Makes sense. So would I still need the heavy AR-10 BCG and an AR-10 upper OR does an AR-15 upper fit on a 10 lower with a 308 bolt?

wknight40 04-28-2014 10:39 PM

I believe on the the AR15 platform the closes would be the 7.62X39. The 308 is 7.62X51.

The usual round for the AR 15 is 5.56X45. The 308 is longer than the 5.56 round and will not fit the length of the mag well. The 7.62X39 being shorter will fir the mag well.

I have read some post's the the 7.62X39 does not fit the mag well properly as it prefers a curved magazine such as what is found on the AK-47.

fa35jsf 04-28-2014 10:43 PM

OK. Thanks for all the advice.

Triumphman 04-28-2014 10:46 PM

All 308s are considered an AR10 or whatever name the manufacturer gives to that model, to distinguish it from a "true" AR15 to keep from confusion.
This is due to the larger Receivers/Magazines/Barrels/BCGs that are required. They won't interchange with AR15 platform.

Just like any Bolt Action 22Magnum might look exactly like their counterpart 22LR from the same Manufacturer, but they're different and 99% of stock components won't/can't interchange.

sweeper22 04-29-2014 02:59 AM

An AR10 build can be quite similar to an AR15 build, but requires a bit more homework as well as 308 specific parts.

The two are not interchangeable. And for that matter, many AR10/308 parts and pieces are not interchangeable the way AR15 parts are from one brand to the next...which is where the 'homework' applies.

In many cases, buying a complete AR10 is the safest bet.

Txhillbilly 04-29-2014 03:48 AM


Originally Posted by fa35jsf (Post 1567186)
I know that AR-10 is chambered in 308 but those are heavy.

That all depends on the configuration of the "AR-10" platform. My DPMS LR-260H is lighter than my RRA 20" Varminter AR-15.
The DPMS has a 20" HBAR style barrel,and the RRA has a 20" Bull barrel.

sandog 04-29-2014 11:06 AM

If you want to stay with the lighter smaller AR-15 platform, one that comes close to the .308 in power is the .30 Remington AR. It will shoot 150 grain bullets at 2500 +, and lighter bullets a bit faster. But I believe only Remington makes the uppers and complete rifles, and the fatter round won't work with standard 5.56mm magazines, so your selection of magazines will be slim. I don't see the .30 Rem AR listed on Remington's R-15 page, only the .223 and .204, so maybe they dropped it. Too bad as it is an awesome round. I guess not enough people discovered it, but someone could locate a used one. I would want one but would reload for it as I haven't seen much factory ammo around. Something like the .300 blackout would be the obvious choice for an AR-15 in .30 caliber, but the round is way short of the power of a .308.

JonM 04-29-2014 01:44 PM

Only the colt le901 will do what your looking for.

Scar17s is a great lightweight 308. Fully loaded WITH optic my scar comes in at 11 pounds including storage compartments filled with tools and parts...

I could shave off some weight by just using irons or a aimpoint and emptying the storage out. I've done some mods to it and its far from stock.

Since that pic I've removed the factory sights and replaced them with magpul mbus sights. Saving another 3 ounces.

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