5.7x28 AR Upper. Would you??

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Big Bad Wolf

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So... I've been busy looking around for a new upper for my ARs. Found an upper for this round and uses the 90's 50rd magazines the mount kinda the same way on the P90's do. Ejects out of the bottom through the mag well. I honestly don't know enough about this round other then very much same as .22WMR or .22Hornet rounds. Would the ballistics be that much better out of a 12" or 16" barreled upper? (and yes, I do have a SBR lower so not to worry)

Let know what y'all think.
 

Big Bad Wolf

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image-3128103004.jpg

Here's a picture of the uppers.
 

Seadog

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It has the cool factor and compact 50 round mag, but I wouldnt unless rolling in doe. Rounds are expensive and not plentiful
 
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1S1K

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The round would be slower on a 12in by about 200 f/s compared to 16in, but if you have an sbr lower, 12in would be so much cooler if you can get a can, it would just be sticking out by about an inch or so past the handguard though I have not seen that type lately. Cope's have them for $575 a while back.
 

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