I have side charging. 458 socom on a dpms lower with around 200 rounds thru it. It kicks like a 12ga with bird shot and runs great. It comes with a 10 round mag,  magpul mbus and about 20 rounds of factory ammo. 
$650 obo or trade for lever action .44 mag or pcc chambered in .45
Will sell just upper and ammo for $350
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