Question about uppers and lowers - XDTalk Forums - Your HS2000/SA-XD Information Source!

KEVWYO · 10-17-2007, 01:56 AM

... and no this isn't about what you prefer in women

! This actually could be a dumb question ...

Can you take a .308 upper and mount it to a 5.56 lower? I'm not sure if there is a difference in .308 mag size which would affect the mag well size.

Thanks!

T.J. · 10-17-2007, 02:14 AM

no you cant do it. dont ask me why but ive asked the guy at my local gun shop because i was wanting to pick up a complete .308 upper and interchange on my lower and he said that i would have to get a lower made for a .308

i think your right is becuse the size of the round is bigger and requires a differnt size mag. but i could be wrong

KEVWYO · 10-17-2007, 02:17 AM

Quote:

Originally Posted by T.J.

no you cant do it. dont ask me why but ive asked the guy at my local gun shop because i was wanting to pick up a complete .308 upper and interchange on my lower and he said that i would have to get a lower made for a .308

i think your right is becuse the size of the round is bigger and requires a differnt size mag. but i could be wrong

Bummer. I was thinking this might be the "easy and cheap" way into the .308 round.

T.J. · 10-17-2007, 02:37 AM

i actually think it has something to do with the hammer but im not sure

ichy_trigger · 10-17-2007, 06:10 AM

The length of the round is different so it would not be able to accept mags made for .308. Single shot? maybe...

**nikon777** · 10-17-2007, 05:35 PM

get a 6.8 upper

.40-.45 · 10-17-2007, 05:49 PM

mag well size

and I'm guessing a buffer and buffer spring issue

among other things

John A. · 10-17-2007, 09:14 PM

You can't because the specs are almost entirely different altogether between the two.

An AR15 lower and AR10 upper won't even mate up at the pins. Hence primarily because of the magwell is considerably longer in the AR10, though there are several more differences too, but not being able to join them together would be the main reason they won't interchange.

If you're wanting something along the ballistics of the .308 in an AR platform, consider the 6.5 Grendel upper.

Deadcenter · 10-17-2007, 11:10 PM

450 bushwhacker !

KEVWYO · 10-17-2007, 11:23 PM

Quote:

Originally Posted by John A.

You can't because the specs are almost entirely different altogether between the two.

An AR15 lower and AR10 upper won't even mate up at the pins. Hence primarily because of the magwell is considerably longer in the AR10, though there are several more differences too, but not being able to join them together would be the main reason they won't interchange.

If you're wanting something along the ballistics of the .308 in an AR platform, consider the 6.5 Grendel upper.

OK then ... will the 6.5 Grendel upper fit a 5.56 lower?

10-17-2007, 01:56 AM	#1
KEVWYO XDTalk 3K Member Join Date: Apr 2007 Location: Oregon Posts: 3,404	Question about uppers and lowers ... and no this isn't about what you prefer in women ! This actually could be a dumb question ... Can you take a .308 upper and mount it to a 5.56 lower? I'm not sure if there is a difference in .308 mag size which would affect the mag well size. Thanks!

10-17-2007, 06:10 AM	#5
ichy_trigger XDTalk 5K Member Join Date: Jan 2004 Location: Dayton, Ohio Posts: 8,085	The length of the round is different so it would not be able to accept mags made for .308. Single shot? maybe... __________________ "The person who has nothing for which he is willing to fight, nothing which is more important than his own personal safety, is a miserable creature and has no chance of being free unless made and kept so by the exertions of better men than himself." http://militarysignatures.com/signatures/member2645.png

10-17-2007, 05:35 PM	#6
nikon777 XDTalk 5K Member Join Date: May 2003 Location: Cleveland, OH. The Danger Zone. Posts: 7,533	get a 6.8 upper __________________ 1. Banning of future weapons. 2. Registering current weapons. 3. Confiscation. My blog

10-17-2007, 09:14 PM	#8
John A. XDTalk 500 Member Join Date: Jun 2006 Location: KY Posts: 676	You can't because the specs are almost entirely different altogether between the two. An AR15 lower and AR10 upper won't even mate up at the pins. Hence primarily because of the magwell is considerably longer in the AR10, though there are several more differences too, but not being able to join them together would be the main reason they won't interchange. If you're wanting something along the ballistics of the .308 in an AR platform, consider the 6.5 Grendel upper. __________________ "The 2nd Amendment wasn't adopted into the Constitution because the authors liked guns or the destruction they could cause, but to give ordinary citizens the ability to protect themselves and their family and to take up arms against anyone in a governmental position who tried to deny those fundamental and God given rights." Ecclesiastes 3: 1-8 Last edited by John A.; 10-17-2007 at 09:16 PM.

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10-17-2007, 05:49 PM	#7
.40-.45 XDTalk 500 Member Join Date: Apr 2005 Location: Iowa Posts: 759	mag well size and I'm guessing a buffer and buffer spring issue among other things

10-17-2007, 11:10 PM	#9
Deadcenter XDTalk 500 Member Join Date: Mar 2007 Location: Trucking the USA Posts: 919	450 bushwhacker !