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Old 02-07-2012, 05:42 AM   #21
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I mostly see DPMS, Bushmaster, S&W and sometimes Colt in my LGSs, which is why I did builds. My favorite shop does have an LMT upper now.

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Old 02-07-2012, 12:26 PM   #22
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Quote:
Originally Posted by SmokyMtnHiker View Post
Sorry thay was an incomplete statement..I'm wanting to build my AR.
I'll be shooting mainly 223 (for the cost) but maybe the versatility of a 556 for 'custom loads' if I so choose. Would that be a reasonable choice in a build? Or, just a standard 223 build? I'm a weekend range rat first and foremost.
I’m wandering around a similar quagmire trying to decide what flavor of upper to choose. There’s a photo on the web somewhere displaying .223 keyholes all over a 100 yard target from a mismatch between the bullet weight and the barrel twist.

How long is your range? From what I’ve researched: Range distance & target size > ammunition choice > twist rate & barrel length required > choice of upper.

Lilja Rifles has a webpage with a recommended twist rate chart. You’ll have to scroll down a little bit to see it:

http://www.riflebarrels.com/faq_lilja_rifle_barrels.htm#twist%20rates

They recommend choosing the twist rate for the heaviest bullet you plan to shoot. However, if you build for heaver match bullets, you might have a problem trying to hit something with surplus 55 grain.

At least it's relativity easy to change an AR 15 upper.

If someone here has good experience with what they’ve chosen, I’d appreciate it.
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Old 02-07-2012, 12:44 PM   #23
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Quote:
Originally Posted by Quentin
I mostly see DPMS, Bushmaster, S&W and sometimes Colt in my LGSs, which is why I did builds. My favorite shop does have an LMT upper now.
Sometimes, I think I'm pretty lucky. My LGS has EVERYTHING it seems. LWRCI, H&K, LMT, FNH, POF, Daniel Defense, S&W, etc, etc....if you have the jack, you can take it home THAT DAY.
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