View Full Version : 6.8spc through 5.56 reciever?
Another noon question here.
Is it reasonable to assume that it is safe and possible to run 6.8spc through a standard 5.56 NATO lower obvoiusly with the proper upper assymbly? Would the 5.56 mags be used or are there purpose built mags?
Yes the lowers are the same on 5.56 and 6.8, you just need the 6.8 upper/barrel and the 6.8 bolt. You also need 6.8 magazines, my suggestion would be Barrett. Check the 68forums there is a wealth of knowledge on the 6.8 round.
6.8 was designed to be run through platforms designed for 5.56. Lowers and uppers on the AR platform are the same. The magazines are different.
6.8 was designed to be run through platforms designed for 5.56. Lowers and uppers on the AR platform are the same. The magazines are different.
To clarify are you saying that the 5.56 upper is the same as the 6.8 upper?
All things being equal (i.e. being from the same manufacturer) the only difference between a 6.8 rifle/upper and a 5.56 rifle/upper is the bolt, barrel, magazines.
A perfect example to answer the OP question is the LMT MRP. I have both the 5.56 bolt/barrel and the 6.8 bolt/barrel. The upper and lower does not change, only the bolt, barrel, and magazines.
Yes, you can run 6.8 through a 5.56 lower as long as you have the correct bolt/barrel in your upper.
Wow good fast info thanks guys. Unfortunatly I'm in the gun loving state of Ca. Anyone know where I can get some good 10rnd mags? I don't seem to see any on magpuls site.
PRI also makes good 6.8 mags, check them out.
HiggsBoson
12-16-09, 14:59
palmettostatearmory.com has a good and inexpensive selection of 6.8 mags and ammo
The overall loaded length of 6.8 doesn't work well with the polymer thickness necessary. IIRC Magpul just can't make any, and they've said so. If it could be done, they would.
Metal magazines are it.
The overall loaded length of 6.8 doesn't work well with the polymer thickness necessary. IIRC Magpul just can't make any, and they've said so. If it could be done, they would.
Metal magazines are it.
They figured it out for .308 though...:confused: I think if the market grows for the round they might be able to figure out a way to make it work...;) .308=2.75 OAL 6.8=2.31 Just sayin.
All things being equal (i.e. being from the same manufacturer) the only difference between a 6.8 rifle/upper and a 5.56 rifle/upper is the bolt, barrel, magazines.
A perfect example to answer the OP question is the LMT MRP. I have both the 5.56 bolt/barrel and the 6.8 bolt/barrel. The upper and lower does not change, only the bolt, barrel, and magazines.
Yes, you can run 6.8 through a 5.56 lower as long as you have the correct bolt/barrel in your upper.
I have both also, complete rifles but both none the less... I sure wish they would go to 1/11 or even 1/12 on the 6.8. That said the 1/10 barrel is very accurate, but I am surprised they haven't changed the chamber and twist yet....
HiggsBoson
12-21-09, 15:58
They figured it out for .308 though...:confused: I think if the market grows for the round they might be able to figure out a way to make it work...;) .308=2.75 OAL 6.8=2.31 Just sayin.
You're comparing apples to oranges. Sure, Magpul could make a 6.8 PMAG that fits inside a .308 magwell, but that's irrelevant (and contrary to the 6.8's reason for existing). .308 has a longer OAL but it (+magazine thickness) fits within a much larger magwell than the OAL of the 6.8 (+magazine thickness), which has to fit inside a magwell designed for 5.56. The issue with 6.8 is the tighter tolerances as a result of having to fit inside the magwell of an AR-15.
You're comparing apples to oranges. Sure, Magpul could make a 6.8 PMAG that fits inside a .308 magwell, but that's irrelevant (and contrary to the 6.8's reason for existing). .308 has a longer OAL but it fits within a much larger magwell than the OAL of the 6.8, which has to fit inside a magwell designed for 5.56. The issue with 6.8 is the tighter tolerances as a result of having to fit inside the magwell of an AR-15.
Did you read the thread I quoted? He said that they couldn't make it because of the length, I am assuming he is referring to a .223 round... I would think they could make 25 round Pmags if the segment (6.8) was large enough to warrant doing so... The 6.8 is only slightly longer than .223 PRI or Barrett's work fine for me so I could care less... My point was that if MP felt there was a market they could build one... I guess only they know... Everybody said they couldn't do it with .308 based on the magwell and wall thickness needed for the round and we know that wasn't true...
You very well could be right that the tolerance is that close, but in looking at the rounds and mags side by side its hard for me to see that...
Here is a side by side pic I tool comparing 55gr 5.56 and 90gr 6.8....
http://i156.photobucket.com/albums/t5/d90king/DSCN1150.jpg
Powered by vBulletin® Version 4.2.5 Copyright © 2024 vBulletin Solutions, Inc. All rights reserved.