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Actually the bolt on that pic states 5.56x45. So I am not sure you posted the correct pic. I beleive this is the pic you intended to post.


 

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I saw the bolt carrier as well; however, if you notice the lower receiver is the same type as the one in your picture and different from the standard 5.56 ACR lower receiver. Also, as you know, the modularity of this rifle only requires the bolt to be changed when switching between calibers and not the complete BCG. So, based on those facts along with a tech drawing of a 7.62 lower that one of the other forum members provided, I assumed it was a 7.62 version of the ACR... But you could be right! Either way, I was just trying to spur up some more interest on the ACR since it seemed our forum was stagnate.
 

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You are right, but I saw the 5.56 magazine and assumed that that one was of the 5.56 version. Typically when you run x39, you end up with a banana mag.
 

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I am completely new to rifles, especially assault rifles. However, the ACR caught my attention when it was going under the name Masada and was touted to switch between 5.56 and 7.62x39. However, what was never really clarified is whether this switch was just barrel, bolt, and mag or whether a different lower was used as well.

Again I'm new to this, but is it possible to make a lower that accomodates such a difference in calibers? If not, and you have to switch lowers with everything else, what makes the ACR any different from an AR-15 with a 7.62 conversion? Aside from the gas-piston operation, which I don't feel alone justifies the additional cost.

I can't see myself really caring about 6.8 or 6.5 rounds; I want the ability to use the two most common assault rifle rounds in one weapon. If the ACR does that, it might be worth the heavy price tag (even sans cost of other barrels!). If the ACR does it, but does it by being essentially two guns, why don't I just buy an AR and an AK both for a couple hundred bucks less than the ACR?

I hope I'm not coming off as a nay-sayer. I really want the ACR to be everything I want. I'm just doubting whether what I want is feasible.
 

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Never mind, I just found the owners manual (http://www.bushmaster.com/electronic-documents/ACR-owners-manual.pdf) and read that "Some calibers may require an alternate lower to accept different sized Magazines."

*Sigh*

No point to the ACR now. Still a cool looking gun, but unless 6.8 takes off as a 3rd world round and is available en masse, it's cheaper to buy an AR and an AK, because an ACR doing 5.56 and 7.62 would be two guns anyway.
 

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Hold on there cowboy. You should first consider which calibers you are planning on shooting. If you plan to shoot both 5.56, 6.5, 6.8, and 7.62x39, then you should be good to go with a single lower. However, if you plan to shoot both 7.62x51 (.308), then you will have to have a different lower no matter what platform. No rifle as of yet can shoot 5.56, 6.5, 6.8, 7.62x39 and still shoot .308 on the same lower.

Basically it all comes down to the magazine. If you can fit the caliber into a STANAG (AR-15) magazine then you can shoot it through the ACR that is chambered 5.56, 6.5, 6.8. The 7.62x39 can fit inside a magazine the same size as the STANAG but it must have a different curve to the magazine because of the rounds taper.

C-products makes a magazine that holds 30 7.62x39 rounds and fits inside a standard 5.56 magazine well. There are many, many platforms out there can support both x39 and 5.56 in the same lower.

http://www.cproductsllc.com/shop/product_info.php?cPath=22_36&products_id=59

And 6.5G: http://www.cproductsllc.com/shop/product_info.php?cPath=22_32&products_id=52

And 6.8 SPC: http://www.cproductsllc.com/shop/product_info.php?cPath=22_34&products_id=55

All these magazines will work in the ACR just fine. No need for a separate lower receiver.

However, until you can find a magazine that will hold both .308 and the 5.56 (for example) then you will always have to have a different lower.

I hope that all makes sense. Why don't you explain what it is you are looking to do exactly and why you were interested in the ACR to begin with.
 

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I'm sorry, looking at my first post, I guess I wasn't completely clear.

Although I appreciate nice weapons, I don't really consider myself a "gun-nut." So, pardon my limited knowledge. I own only one firearm, a Sig P229 in .40cal for home defense (and occasional target practice). I have politely declined getting a CCW despite many of my friends and family urging me to, several of them being law enforcement. I just don't go where I feel I would need a weapon. I know, you never know, but I prefer to try avoiding trouble.

Now that you know a little bit about my general feelings towards firearms, you might be wondering why I'd be interested in an assault rifle at all. Frankly, it is because I don't trust my fellow human beings. My work involves emergency planning and the thought of adding a rifle (and probably a shotgun as well) to my personal plan has been stewing for some time. When the Masada/ACR came on my radar from Futureweapons (isn't Mack great?), the idea of a weapon that could chamber the two most common rounds on the planet, 5.56 Nato and 7.62x39 (I assume anyway), caught my eye. I'm sure the 6.8 and 6.5 Grendel are great rounds, but I don't imagine I'd really notice a difference. I liked the concept of the ACR as a weapon that could fire the ammuntion I would most likely be able to find in an emergency: 5.56 and 7.62x39. Whether that emergency is a dirty bomb forcing the evacuation of my nearest metropolis (which happens to be Detroit), or a power outage affecting 1/2 the nation where people don't behave as well as they did last time.

Essentially I want a firearm that in the HIGHLY unlikely event of complete social breakdown that can chamber whatever ammunition is readily available (which I feel would likely be 5.56 and 7.62 Russian). Maybe that sounds paranoid, but I'd rather be prepared than, well, the alternative.

I hope that long block of text gives you some insight.
 

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neelandbob,

You ideas are perfectly sound and make perfect sense. What I am try to tell you is that with a 5.56 version the ACR you can do exactly what it is you ant to do and all you would need is the 7.62x39 (russian) barrel/bolt and some c-products 7.62x39 magazines which cost about the same as most 5.56 magazines. In fact I have an XCR rifle which I can do the exact same thing.

However, with 5.56 you will have an easier time finding ammo for since more people have AR-15 and the like than AK47, etc in the U.S. But having the option to run both through your gun is never a bad idea. Again the ACR, XCR, SCAR, and more can all do that with a single lower receiver.

Hope that helps. If you wish to have a definitive source from Bushmaster confirm, please Private Message AWOLSCOUT and ask him. He is the product manager for the ACR.
;D
 

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Well, I sure hope you are right. I shot some rifles for the first time on Monday, and had a good time of it. Shot a MSAR Steyr AUG emulator, an AR and a M1A. I liked them all, but didn't like the taste, yes taste, of the MSAR. I guess the bullpup design put too much discharge near my face for my liking. The trigger bugged me a bit too. Not the pull, the trigger itself, had a ridge or something I didn't like. The AR was real nice but I had a little trouble looking down the red dot he had on it...didn't feel quite right (maybe my face is too big!). And the M1A was sweet but heavy, even for a big guy like me.

Well, needless to say I'll be checking in to see what people are saying as they get delivery. Thank you ACRFan, for the time and information, you have been awesome.
 

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I hope that all makes sense. Why don't you explain what it is you are looking to do exactly and why you were interested in the ACR to begin with.
 
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