Introducing the Smith & Wesson Volunteer Series; Built on greatness. S&W’s rifles are chambered in 5.56 NATO and configured for a wide variety of recreational, sport shooting and professional applications! These rifles offer; premium stocks, grips, handguards, triggers, sights, upgraded 5R rifling and ambidextrous features. The S&W Volunteer Series rifles are purpose built and are everything you’ll need right out of the box! Proven. Trusted. Improved. The Smith & Wesson Volunteer XV Series. This model features a picatinny rail gas block.