How Useful Are Caliber Conversions in Firearms?
Oleg Volk discusses some common conversion options currently available.
Range Review: CMMG Resolute 9 mm Upper and Magazine Inserts
Been thinking about a pistol-caliber carbine, but didn't want to have to buy a whole new gun? With CMMG's 9 mm upper receiver and AR-15-based 9 mm magazines, you can keep your favorite lower.
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