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Yes, this is radial delay blowback. Information straight from the manufacturer. Hope this helps.

Yes, according to CMMG "OPERATING SYSTEM RADIAL DELAYED BLOWBACK" Full specs here: http://cmmg.com/resolute-100-rifle-mkgs-9mm

Jim, yes Sir, this UPC code is a radial delay blowback designed rifle. Features : RADIAL DELAYED BLOWBACK, 1/2-28" MUZZLE THREADS, A2 COMPENSATOR MUZZLE DEVICE, 4140 CM BARREL MATERIAL. Cheers and stay safe!

Jim, yes sir, according to CMMG web site, it is radial delay blowback. Have a great day!