New ACR-2

Boomer686 said:
If I could get one in .308 I'd be on it like a fat kid on a greasy cheesburger. I was all geared up for SCAR Heavy until that got derailed. Now it looks like it will either be the XCR-M in OD or the FAMAE 552......depending on who calls me back first!
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You do realize that the ACR-2 will become available in .308 right after you buy an XCR-M, right? ;)
 
blaxsun said:
Update to post one. The lower is confirmed as magnesium, with a fixed (but collapsible) stock. Get this: with the changes on a 14.5" barrel the weight is now 6lbs!
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Hmmm... Somehow to me, adding magnesium to a rifle seems counter intuitive.

rpm_a_lemans_600.jpg
 
I have to wonder if the location and fold of the charging handle would make it difficult to use with a PEQ15 or similar device on the forerail?

Anyway, daddy likes.

Quickchange barrels are over rated. You have to rezero anyway.
 
ESQ said:
I have to wonder if the location and fold of the charging handle would make it difficult to use with a PEQ15 or similar device on the forerail? Anyway, daddy likes.

Quickchange barrels are over rated. You have to rezero anyway.
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Hard to say; I personally prefer the originally ACR charging handle design (it slants down). Seems that way, although the Beretta ARX-160 looks like a pretty neat setup.
 
raks said:
Hmmm... Somehow to me, adding magnesium to a rifle seems counter intuitive.

rpm_a_lemans_600.jpg
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Magnesium among other things (including aircraft wheels, and high performance car wheels) is used in some car engines, Porsche and IIRC Volkswagen use cast magnesium/aluminum alloy in some engine blocks.

Magnesium is a great material, magnesium as a material is very reactive, but only in a molten state. The powder is very dangerous because it has so much exposure to oxygen that it will combust and burn very hot, BUT in a billet or cast part form, its quite stable, and more to the point extremely strong and very light. At the temperature you'd be worried about something happening, you would have an AR15 upper melting or distorting from the heat.

I'm actually surprised it hasn't been used MORE in firearms - older magnesium alloys could distort and flex when heated a couple hundred degrees - but new alloys are stable enough to be used (as for-mentioned) as engine blocks which constantly run at high temperatures... although casting is a little harder for startup costs, and would require a lot of thought into how it would be worked. Most of the time its cheaper and easier to machine a block of aluminum than cast a magnesium part.
 
Could have at least made the back of the receiver compatible with the MIAD back straps...the rail looks ugly as hell...They really messed up the masada...
 
blaxsun said:
Hard to say; I personally prefer the originally ACR charging handle design (it slants down). Seems that way, although the Beretta ARX-160 looks like a pretty neat setup.
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Holy smokes please stick to the OP's original discussion i.e. not the ARX-160. All this potential unobtain-a-magnesium is distracting! Oh wait, you are the OP.... :p
 
alexD92 said:
Could have at least made the back of the receiver compatible with the MIAD back straps...the rail looks ugly as hell...They really messed up the masada...
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I believe you'll find it will accept any grip with an "L" backstrap, MIAD included.

zxcvbn said:
Holy smokes please stick to the OP's original discussion i.e. not the ARX-160. All this potential unobtain-a-magnesium is distracting! Oh wait, you are the OP.... :p
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Completely relevant. The ratchet/barrel removal assembly on the ACR-2 was removed for submission to the Army Improved Carbine competition. The ARX-160 is the future of quick-change barrel systems and ceramics (2:50 mark). Check out the location of the magazine/bolt releases and the ability to switch not only the side for the charging handle - but the ejection port as well. This thing is an ACR killer, but if the ACR sported a few of these features...

[youtube]6YS8eAiDUzs[/youtube]
 
On the 160 the dual ejection ports make diagnosing stoppages supper quick and you can push efed up rounds through and out of the rifle with out the fishing and shaking required with most rifles.
 
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