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12/13/2008 2:25:44 PM EDT
I have what may be a stupid question, but i will ask it anyway.

I was at the gun show today looking for a striped lower receiver so i could do a build of an AR. I have never build an AR, but I have been doing more than a little reading here in the forums. I picked up a MMS striped lower for $190. When I mentioned that I planed to use it to build a .308 he said that it would not work, because the Mag well is for 5.56. I got it anyway hoping that he was incorrect.

So this is the question I guess. As I understood it. I could use a regular AR lower and mate it to a .308 upper (if I can find one at this point) and all would be well as long as I get the correct Magazines (looking at the ones that C Products makes). Is this correct or am I way off?

Thanks!
12/13/2008 2:30:10 PM EDT
[#1]
No, the 308 upper is significantly bigger and longer than a 556 lower receiver. To build a 308, you need to buy a 308 receiver.
12/13/2008 2:31:53 PM EDT
[#2]
I thought the AR-10 Lower was longer and very different?
12/13/2008 2:51:09 PM EDT
[#3]
12/13/2008 3:07:55 PM EDT
[#4]
If you want to use the c-products mags you also need a dpms/sr25 compatible lower.
12/13/2008 3:25:29 PM EDT
[#5]
OK if I understand this picture correctly. The upper in the picture is an AR-10 and the lower is an AR-15. So if I understand correctly now, and yes I know this wont be popular, "all" the .308 ARs are AR-10's with AR-10 lowers. Is that basically correct?
12/13/2008 7:00:00 PM EDT
[#6]
yes ar10's require matching upper and lower just like ar15's.
noveske, armalite,dpms all make inchangable upper and lower's for ar10's

bushmaster used to make an ar10 {they called it BAR10}, and rock river arms bought the project from bushmaster and now  RRA make theyre ar10{ they call it LAR8}.
the bushmaster bar10's is interchangable with rock river arms lar8, both upper and lower receiver's.
12/14/2008 8:36:04 AM EDT
[#7]
Quoted:
yes ar10's require matching upper and lower just like ar15's.
noveske, armalite,dpms all make inchangable upper and lower's for ar10's.


NO!  these do not all interchange!!!!

there are two formats:  lets call them the Armalite format and the DPMS format:

Noveske is on the Armalite format

On the DPMS format is POF, Remington, I'll let someone else complete the list, I'm too tired to try to think of them all

12/14/2008 9:00:05 AM EDT
[#8]
Quoted:
yes ar10's require matching upper and lower just like ar15's.
noveske, armalite,dpms all make inchangable upper and lower's for ar10's

bushmaster used to make an ar10 {they called it BAR10}, and rock river arms bought the project from bushmaster and now  RRA make theyre ar10{ they call it LAR8}.
the bushmaster bar10's is interchangable with rock river arms lar8, both upper and lower receiver's.


Untrue, Armalite, Noveske and GA Prec all use the same format,

DPMS, Remington, POF and a few smaller companies have a different format.


12/14/2008 9:00:29 AM EDT
[#9]


Is that yours? You know your bridging the upper and FF rail right?
12/14/2008 9:33:16 AM EDT
[#10]
Quoted:

Untrue, Armalite, Noveske and GA Prec all use the same format,

DPMS, Remington, POF and a few smaller companies have a different format.




GA Precision will use whichever format you want.....
12/14/2008 10:10:43 AM EDT
[#11]
Quoted:
Quoted:

Untrue, Armalite, Noveske and GA Prec all use the same format,

DPMS, Remington, POF and a few smaller companies have a different format.




GA Precision will use whichever format you want.....


Ah, your right! I forgot about that (...)
12/14/2008 11:35:45 AM EDT
[#12]
Whew!!  ^^^^^


Thank Beavis!!  Because my GAP built rifle only takes DPMS magazines (and says DPMS on the side!!)  -well, I have used C-product magazines and Knight's Armament magazines for it as well, but you know what I mean!!
12/14/2008 12:15:25 PM EDT
[#13]
Quoted:


Is that yours? You know your bridging the upper and FF rail right?


yep-it still shoots out to 1k just fine. I don't believe its a sin the bridge the gap and have yet to see any problems as many people "report". That armalite mount has a solid base and metal clamping mount. That specific scope is usually not on there, but I throw it on there when I'm testing loads .

YMMV
12/14/2008 1:48:07 PM EDT
[#14]
Quoted:
Quoted:


Is that yours? You know your bridging the upper and FF rail right?


yep-it still shoots out to 1k just fine. I don't believe its a sin the bridge the gap and have yet to see any problems as many people "report". That armalite mount has a solid base and metal clamping mount. That specific scope is usually not on there, but I throw it on there when I'm testing loads .

YMMV


Thats some nice glass. I've never bridged but if it works for you thats all that matters.

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