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http://www.midwayusa.com/viewProduct/?productNumber=431749
see post here
http://www.ar15.com/forums/topic.html?b=3&f=12&t=468988

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Global Tactical 18 inch midweight SPR barrel.

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I have decided to build a SPR type AR and have been looking for a fluted 18" barrel with an SPR profile with a 1/8 or 1/9 twist.  I cannot afford a $400+ barrel at this time so I am looking for a cheaper alternative, the spr profile is not necissary but I do not want a HBAR profile, and I would like the flutes for wieght reduction mostly.  Does anyone have any affordable alternatives for me? in the $200-$300 range.

Also, I would considering a 16" barrel since they seem easier to get a hold of.  What kind of accuracy difference am I looking at?  I will mostly be shooting 55gr federal and some 62gr if necessary(SHTF) and maybe some blue hills if I decide to spend the money on it.  Say from ranges of 0-200 yards.  Would an 18" barrel be at a big advantage at 200 yards compare to a 16"?

Any help would be appreciated, and remember I'm trying to build this w/o depleting my bank account.

Thanks
Ian

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Call me a SPR snob but a 16" 1/9 barrel really is NOT what is used in building SPRs. You don't want to spend $400 on a barrel then don't. Go to ADCO and buy a SPR White Oaks 18" 1/7 barrel for $275. They have both mid and rifle gas legnth in stock. An even cheaper and maybe better option if you are mostly shooting 55gr is either a DPMS MK12 or the mini SASS barrel. Both of tese are 1/8 twist and under $200 but I have no idea where you may find one instock. I have never used any of these barrels but all three are well liked by people who really have them.

NOTE-The DPMS MK12 is that in name only––its not a true "MK12" barrel

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I understand that a 16" barrel is not used when building an SPR, I was just thinking of alternatives.  I emailed DPMS asking if i could purchase the Mini SASS barrel as a barrel assembly, I guess I will have to wait and see.
And thanks for the recommendations.
I really wish I could afford to build a better SPR.

Thanks
Ian

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Build what you can afford and enjoy it.  It took me two years to put my MK 12 Mod 0 together.  Its not 100% correct, but fits my needs perfectly.  I used a leupold 4.5-14x40mm  MK4 scope, as this rifle is used extensively on prarie dogs and coyotes.  I opted for a #40L rear sight, and replaced the ARMS rings with Larue when the ARMS rings failed.  Im ponying up the cash for an Ops 12th model supressor soon, but for now my AAC M4 2000 will do.