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8/30/2008 8:37:38 AM EDT
What do I need to build this upper? I've already got a 16" YHM barrel. Would I use a midlengh or carbine gas system? What do ya'll recomend?? Thanks in advance guys!!!

8/30/2008 10:37:21 AM EDT
[#1]
That looks like a middy with a midwest industries rail on it. You could do a carbine length or mid-length. For the carbine length you could use a low profile gas block and have mid-length or rifle length handuards fit over that. I could be mistaken but that one looks like it has a railed gas block with a YHM sight on it.

If you already have the barrel it should be drilled for a gas block or have a fsb pinned already. That would be the deciding factor.
8/31/2008 5:00:21 PM EDT
[#2]
Does anyone know where I can get that railed gas block that's on it? Can't find one like that.
8/31/2008 5:04:22 PM EDT
[#3]
CMMG INC

Click the CMMG INC link, then go to accessories, gas blocks. They have everything you are looking for on that page alone.

8/31/2008 10:22:25 PM EDT
[#4]
Armalite sells a midlength barrel with a gas block similar to that (if not exactly the same - hard to tell from the side/rear).
www.armalite.com/ItemForm.aspx?item=B15A4C&Category=a5c527d6-017c-40c2-80f2-59e99534f863

That is indeed a Midwest Industries free float rail system.  I have a carbine-length one and love it.
www.aimsurplus.com/acatalog/Midwest_Ind._Free_Float_Mid_Length_Handguard.html

The only thing YHM I see on the whole rifle is the front sight stuck on that railed gas block.  The rear sight looks like an ARMS 40L to me, and the optic looks like a Millet DMS-1 Leupold (?) in a Larue SPR mount.  Both very pricey.  

The Leapers $15 foregrip and "plain M4" stock look out of a place on a high-dollar build like the one pictured.  Both work great, but neither is at all common with those other components.  I would expect a Larue FUG or at least a Tango Down VFG and a Magpul CTR or a VLTOR modstock would fit in better with a gucci-gear build such as this.  The expensive Surefire weapon light, Magpul MIAD grip, notch-leg Harris (or clone) bipod, windowed PMAG, and winter trigger guard earn extra style points, but the standard Magpul magazine pull instead of a Ranger plate is so passe.  

I give it a 4 out of 5 overall.    Solid effort but with room for upgrade still.
9/1/2008 9:08:34 PM EDT
[#5]
The optic is a leupold, and the mount is a larue QD.  The bipod is probably a harris bipod.  Muzzle device is a standard A2 birdcage.  
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