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Posted: 3/4/2009 4:12:37 PM EDT
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I've been lurking the forum for a while now and am finally going to get an AR. I own a couple of handguns so I'm not new to firearms, just have specific questions about ARs.
I was wondering if I should build/get a rifle that uses the NATO 5.56mm or the 6.8mm. Also what parts besides the lower receiver would be affected if I chose to go with the 6.8mm(i.e. barrel, upper receiver)? Thanks in advance. |
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you need to choose the caliber for yourself. Do a bit more research in the AR Variants Forum.
The bolt, magazine, muzzle device, and barrel are different. All the other parts are the same (including the lower receiver). eta: Welcome to the site |
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I'd stay with the 6.8 forums on arfcom, and the ammunition forum as well...aka the ammo oracle. That way you get all the info instead "fan data"
The lower receiver is the same for either cartridge. You would need a different barrel and bolt. If you so chose, you could have a 556 upper and a 6.8 upper which would swap on to the same lower receiver. |
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I'd stay with the 6.8 forums on arfcom, and the ammunition forum as well...aka the ammo oracle. That way you get all the info instead "fan data" The lower receiver is the same for either cartridge. You would need a different barrel and bolt. If you so chose, you could have a 556 upper and a 6.8 upper which would swap on to the same lower receiver. We're a hell of a lot more than a "fan" sight. 68forums just happens to be a place where you can cut straight through the BS of typical fan boi sights and find exactly what info you need. From a technical standpoint, you'd be a fool not to join 68forums and reap the knowledge that abides within it. I make the same statement for the 458socomforums and for 65grendel as well. This (ar15.com) is the place to find out general info about the AR series, but for specific info, ignore the poster above and visit the forum of the actual caliber you want. |
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I'd stay with the 6.8 forums on arfcom, and the ammunition forum as well...aka the ammo oracle. That way you get all the info instead "fan data" The lower receiver is the same for either cartridge. You would need a different barrel and bolt. If you so chose, you could have a 556 upper and a 6.8 upper which would swap on to the same lower receiver. We're a hell of a lot more than a "fan" sight. 68forums just happens to be a place where you can cut straight through the BS of typical fan boi sights and find exactly what info you need. From a technical standpoint, you'd be a fool not to join 68forums and reap the knowledge that abides within it. I make the same statement for the 458socomforums and for 65grendel as well. This (ar15.com) is the place to find out general info about the AR series, but for specific info, ignore the poster above and visit the forum of the actual caliber you want. this is so true. i bought my first 6.8 which was a bushmaster before i joined 68forums. well had i read that before i bought the upper i never would have got the bushmaster to begin with. i didnt know about combat loads and different chambers. 68 made a big difference. |
| what is the purpose of the rifle? For range use plinking and varmint hunting I would go 5.56. If I was thinking about hunting larger game with the rifle 6.8 would be way better.Just my opinion. Welcome to the site.The 68forums has a wealth of imfo if you decide to take that route. |
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How come on stags website it says that they have a lower receiver for 6.8mm? http://www.stagarms.com/index.php?cPath=18_30 The lower is exactly the same, it just has different markings. Say you wanted to get a 6.8 SBR, you are then required to have a lower with the "6.8" or "multi" caliber marking. Same thing for the 5.56 or any other caliber AR. |
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I'd stay with the 6.8 forums on arfcom, and the ammunition forum as well...aka the ammo oracle. That way you get all the info instead "fan data" The lower receiver is the same for either cartridge. You would need a different barrel and bolt. If you so chose, you could have a 556 upper and a 6.8 upper which would swap on to the same lower receiver. Don't listen to this guy, he has probably never even visited the 68forums.com site. If you want technical information about the 6.8 it is the best site you can go to for that kinda thing. Most the people over there own several different caliber Ar rifles so you will not be steered one way or another based upon opinion, just the facts. There are pages of field testing data over on 68forums, so you can make up your own mind as to whether or not the caliber suits you and your purpose. I for one love the 6.8 I have and plan on getting many more, after I purchased it I immediately got rid of my 5.56. So before you make up your mind, you should go join 68forums.com and read all the info that is there for you to digest. If you feel that this caliber wont suit your needs, based upon actuall facts not "fan data", then stick with the 5.56. I for one go hunting just about everyday of deer season and hog hunt in the off-season, so the 6.8 filled every need the 5.56 couldn't and then some. Either way you go, it is your decision so don't let anyone make up your mind for you based upon opinion alone. Be sure to check out 68forums.com, cause all the information on this caliber cannot be found here without asking the right questions. I am sure any question you may have will have already been answered over on 68forums. |
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How come on stags website it says that they have a lower receiver for 6.8mm? http://www.stagarms.com/index.php?cPath=18_30 The lower is exactly the same, it just has different markings. Say you wanted to get a 6.8 SBR, you are then required to have a lower with the "6.8" or "multi" caliber marking. Same thing for the 5.56 or any other caliber AR. 
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How come on stags website it says that they have a lower receiver for 6.8mm? http://www.stagarms.com/index.php?cPath=18_30 The lower is exactly the same, it just has different markings. Say you wanted to get a 6.8 SBR, you are then required to have a lower with the "6.8" or "multi" caliber marking. Same thing for the 5.56 or any other caliber AR.
Thats pretty funny. I probably am wrong, since I don't have a SBR, but I read that somewhere on this site before. The question was is the lower exactly the same, and the answer is still YES whether or not the information I have received and gave out was wrong. |
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How come on stags website it says that they have a lower receiver for 6.8mm? http://www.stagarms.com/index.php?cPath=18_30 The lowers are exactly the same. The only difference is if they are stamped 6.8mm on the side or 5.56mm. It's purely an issue of looks. You can run either caliber through either lower receiver. I've got a 5.56 STAG lower that I use with a 6.8 SPC STAG upper. Until recently, the 5.56 lowers were easier to find. Now their all hard to find. -David Edgewood, NM |
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