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Old 01-17-2011, 13:52   #1
Tech knight
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Join Date: Aug 2010
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AR15 want to shoot 5.56 & 5.45

I now have plenty of 5.45x39 ammo. What parts do I need?

If I order a Spike's AR15 mid length in 5.56, what other parts will I need to shoot 5.45?

I see Spike's sells a part for shooting 5.45. Is that all I need or do I need a different barrel as well?

On a related note I saw you can switch a single part and shoot .22lr out of it in a youtube video. Is this true?
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Old 01-17-2011, 14:34   #2
ʇno uıƃuɐɥ ʇsnɾ
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Join Date: Mar 1999
Location: Western WA
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You need a whole new upper. And mags.
...the secret is to bang the rocks together, guys.

That which does not kill you has made a tactical error. --Tayler
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Old 01-17-2011, 15:23   #3
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You'll need a 5.45 barrel, and a 5.45 bolt. All other parts are the same as the 5.56
You can run dedicated 5.45 mags, or try your luck using 5.56 mags.

With the 5.56 assembly, you can remove teh bolt carrier group and replace it with a 22lr conversion.
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Old 01-17-2011, 15:42   #4
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Easiest way is to just get a 5.45 upper. S&W is a popular choice as well for them.
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