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6/21/2017 8:25:40 PM
Posted: 10/28/2009 2:56:57 PM EDT
[Last Edit: 10/28/2009 3:02:33 PM EDT by justletmein]
I tried searching for this but no luck. Anything wrong with slapping a 6.8 upper on a 5.56 lower other than it looking stupid or some thief stealing my rifle and putting the wrong ammo in it? I see a lot of lowers marked "Multi" and haven't ever seen one marked 6.8. Just temporary, want to order a Bison Armory upper but don't have the cash for a complete lower so would just swap it onto one of my existing 5.56 lowers for the time being.

ETA: Or if I'm just an idiot please say so. I've never looked into 6.8 until about 20 minutes ago.
Link Posted: 10/28/2009 3:02:05 PM EDT
Same lowers for both calibers, only 308 needs a bigger magwell. You can have 5.56, 5.45, 6.8, 22LR, 9mm (with a block), and plenty of other calibers operating out of the same lower you already have. Won't look any different and will run just fine.

Link Posted: 10/28/2009 3:03:16 PM EDT
Thank you kind sir. I just wanted to be sure.
Link Posted: 10/28/2009 3:26:08 PM EDT
I disapprove of owning the fake AK round, but you can't tell the upper from the other upper.
Link Posted: 10/28/2009 3:58:50 PM EDT
Originally Posted By puskrat:
I disapprove of owning the fake AK round, but you can't tell the upper from the other upper.


Yeah I hadn't looked much into it really, was planning on making a .308 but I just don't have the cash to built it like I like it. This will give me a somewhat larger caliber to slaughter hogs with and a good round to set the kids up on some deer, bigger than .223 anyway, so it'll have to do for now.
Link Posted: 10/28/2009 4:17:40 PM EDT
Originally Posted By puskrat:
I disapprove of owning the fake AK round, but you can't tell the upper from the other upper.


Link Posted: 10/28/2009 4:27:41 PM EDT
I have the AR-15, AR-10 and Ooops... I seem to have an AR in 6.8 too!
Link Posted: 10/28/2009 4:33:06 PM EDT
Originally Posted By Desert_AIP:
Originally Posted By puskrat:
I disapprove of owning the fake AK round, but you can't tell the upper from the other upper.




Ditto.
Link Posted: 10/28/2009 4:33:31 PM EDT
Don't mean to jack the thread, but what IS different on a 6.8 build? Do I need a whole different upper? Or just a different barrel/bolt combo?
Link Posted: 10/28/2009 5:13:24 PM EDT
Barrel, bolt, magazines.
Link Posted: 10/29/2009 9:57:43 PM EDT
Originally Posted By justletmein:
or some thief stealing my rifle and putting the wrong ammo in it?

If someone were to steal your rifle I would not be too concerned about whether or not they use the right ammo!
Link Posted: 10/29/2009 10:04:39 PM EDT
Stag makes 6.8 marked lowers, I ordered some from rainier arms during the rush.
Link Posted: 10/30/2009 4:34:25 AM EDT
Originally Posted By jaqufrost:
Stag makes 6.8 marked lowers, I ordered some from rainier arms during the rush.


Tactical Machining and Essential Arms also make 6.8 marked lowers. I chose a Spikes marked multi for my 6.8 however.

Link Posted: 10/30/2009 4:54:48 AM EDT
A 6.8 upper will fit on a .223 / 5.56 marked lower...no issues. You cannot use .223 / 5.56 mags for 6.8 ammo...you have to buy new mags. 6.8 mags will fit in a lower marked .223 / 5.56.
Link Posted: 10/30/2009 5:05:17 AM EDT
I would feel better if the cal. marked on the lower said "Multi" like the Megas and a few others.
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