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I believe any milspec .223/5.56 upper.
Double3 is right. That's what the Colt website says. The M&P Sport is not mil-spec, but I don't see why it wouldn't work as long as you have the mag well block. You may want to contact the factory or wait on somebody with first-hand experience in this area to chime in before dropping a bunch of dough, though.
 

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I don't. You might want to contact Grant Timberlake from G&R Tactical. He's right here in Ohio and sells stuff like that. His website is gandrtactical.com.

ETA: I believe one of the mods here on Colt Forum owns Olde English Outfitters out in the Dayton area. You might try him, too.
 
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