With rapid-fire menace that hits like a sludge hammer, the trio of Backslider seemingly operates on one mode – full-bore. One can hear their instrumental onslaught approach from as far as those roaring guttural vocals can call out. And the deep-churning backend projects a ferociously imposing ominous tone, ripping through any obstacle that lies in its path with unblinking eyes. Tonight at Union Transfer, they’ll be joined by the primal-passion of apocalyptic grindcore outfit, Secret Cutter, in setting the stage for the possessive thrashing of Virginia’s Pig Desroyer. Union Transfer, 1026 Spring Garden St., 8:30pm, $20, All Ages – Michael Colavita