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Steve, I suspect Competition Rifled Barrel but am not 100%. Springfield can answer conclusively at US: 1-800-680-6866. (Specifications and features): - Springfield Armory National Match M1A Semi-Automatic Rifle - .308 Winchester/7.62x51mm NATO - 22" National Match barrel with a permanently attached muzzle brake and parkerized finish - 1:11" twist, 6 lands and grooves, - Premium air gauged - 10 round magazine - American walnut stock - Two-stage military trigger, match tuned, 4.5-5 lbs - National Match .062" military post front sight - National Match hooded aperture, adjustable: .5 MOA for windage and elevation - 44.3" overall length - 9.8 lbs unloaded.

Springfield can answer conclusively at US: 1-800-680-6866. (Specifications and features): - Springfield Armory National Match M1A Semi-Automatic Rifle - .308 Winchester/7.62x51mm NATO - 22" National Match barrel with a permanently attached muzzle brake and parkerized finish - 1:11" twist, 6 lands and grooves, - Premium air gauged - 10 round magazine - American walnut stock - Two-stage military trigger, match tuned, 4.5-5 lbs - National Match .062" military post front sight - National Match hooded aperture, adjustable: .5 MOA for windage and elevation - 44.3" overall length - 9.8 lbs unloaded.

Hi Steve, CRB Means Carbine (CRB).

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It's not a carbine. I'm fairly certain it indicates that it's a carbon steel barrel. If you look at the stainless models it will list wal/ss. If it's important to know for sure then it would be worth your time to call Springfield.