After about 15 years as a trio, the grand and gorgeous ''The Steady Hand" finds Amherst-based New Radiant Storm King recording as a quartet. The nucleus of its founding members, vocalist-guitarists Peyton Pinkerton (the Pernice Brothers) and Matt Hunter (J. Mascis and the Fog), is augmented by the taut, fluid strokes of drummer George Berkery (Pernice Brothers, the Bigger Lovers) and bassist Caleb Wetmore. A career dogged by unfortunate label choices hasn't daunted gifted indie rockers Pinkerton and Hunter, and maybe it's given them a necessary edge on this, their seventh outing. The lilting vocal harmony of ''The Winding Staircase" is sharpened by chunky, plangent guitar riffs, and there's beauty and anger as the staccato chorus rises in the catchy ''Accountant of the Year." From the careening instrumental ''Overture" to the glistening vocal and a buoyant guitar line of final track ''Sunset Provisions," weak points are negligible. Sure, the band might be named for a heating apparatus. But New Radiant Storm King lives up to its grand moniker here.