Designed specifically for the red-hot, flat-shooting 17 HMR , the B.MAG Blued Heavy Barrel represents a whole new class of rimfire rifle. Thread-in barrel headspacing, rear-locking lugs and a cock-on-close bolt maximize accuracy at long ranges, while user-adjustable AccuTrigger technology allows crisp, customized trigger pulls. It's heavy barrel extracts the utmost precision from the platform.