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L It should be 4 groove barrel 1 in 14 twist for the 7.62mm Nato. Won't shoot modern ammo very well unless you hand load to this specific cartridge/bullet weight. Ron
I too am puzzled about the warning. The whole idea of the DCRA conversions was for civilians to shoot military issue ball ammo (147gr of DA's best). Civilians were strictly forbidden from shooting personal ammunition in approved competition.