Zero actual AK-12 parts. 6.5 Grendel barrel and magazine. I studied photos and used parts and scrap metal I had laying around. Did though order an AK-12 grip from Ronin's grips. Airsoft buttstock, handguards and rear sight leaf off my airsoft version; the buttstock fit like a glove on a US tube and Jmac mod-1 4.5mm rear folding stock adapter. The handguards were a lot of work and getting the top cover rail and front trunnion latching block as well as the rear latching mechanics to work correctly was tedious to say the least. Over 100 rounds using Wolf ammo. Groups around 2 moa consistantly.