The Sako TRG 42 is designed for serious long-range competitions and can accommodate a wide range of accessories to meet demanding needs. In .338 Lapua Mag, it serves as a precise tool for special forces or competitive shooters. It features an all-black stealth design with a black stock and bolt, along with a phosphatized barrel and action. The fully adjustable stock is reinforced with high-tech aluminum for durability.

The robust action is crafted from special steel alloy using cold hammer forging. It includes integral 17 mm axial scope mounting rails with recoil stop-slots on the receiver top. The bolt, featuring three locking lugs, smoothly feeds rounds from a detachable staggered 2-row magazine, ensuring reliable feeding for various ammunition types. The bolt lift operates at a 60° angle, facilitating fast bolt throw.