Chamber: .223 Wylde/5.56 NATO. Similar to SP15, but with higher-level components, including an upgraded Timney trigger, NX15 skeletonized upper/lower receiver set and NOX handguard, and ambidextrous controls. Barrel: 16” 1:8” twist 5R 416 stainless steel. Weight: 7 lbs. SEE POLITICAL PANIC PRICING.