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| - Typically choices range from the original carrying handle style upper to the monolithic upper receiver, caliber variations (5.56mm, 6.5mm, 6.8mm SPC, & 7.62mm), barrel twist (1:7, 1:8, 1:9, etc), different compensators & flash suppressors, sight options and types of barrels and treatments (chrome lined, stainless steel, etc.)
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