The Finnfire was largely based on the Finnscout 78,[1] and also shared some parts with the TRG-S (M995) centerfire series of rifles.
[2] The rifle had an adjustable single stage trigger where the pull weight could be set between 1–2 kg[3] with a similar design as the TRG-S series.
The Hunter version had the slimmest stock,[4] while the Varmint version had a wider forend and a rubberized recoil pad,[5] and the Range version stock[6] was the heaviest stock intended for precision rifle shooting, but still became popular with some types of hunters.
The barrels were hammer forged with a 412.75 mm (161⁄4") rifling twist.
Only later production models were delivered with a threaded muzzle from the factory.