The trigger pull weight is adjustable between 1–2 kg, and is delivered from the factory set to 1.5 kg. Sako 85 can also be delivered with a set trigger. The mechanism can be cycled with the safety applied. The bottom metal is made of aluminum for most of the M85 models, and is delivered in a color matching the receiver: Blued receivers are delivered with a black bottom metal, while stainless receivers are delivered with a grey bottom metal. The receiver has a proprietary integrated scope mount, which is a dovetail rail with varying width (narrower at the rear, wider at the front).
The Sako 85 is test fired at the factory with a 5-round group, which must satisfy a precision requirement better than 30 mm at 100 meters (0.3 mrad).
Stock
The rifle is delivered from the factory with a stock made of either walnut, laminate, plastic[10] or carbon fiber, and with different shapes depending on the intended form of hunting or shooting discipline.
Receiver
The receiver is made in 6 different lengths depending on the cartridge group. The rationale behind the large number of action lengths is to achieve a good fit with the cartridge length, and thereby avoiding an unnecessary long bolt travel, as well as weight reduction.
- Extra small (XS)
- Small (S)
- Small-medium (SM)
- Medium (M)
- Large (L)
- Extra large (XL):
The bolt has three locking lugs, a 70 degree bolt lift, and is milled from a solid piece of cast steel (including the bolt handle).[12] The bolt is cocked on opening, and has controlled feeding with the ejector fixed to the receiver.[13] A special tool is provided for disassembly of the bolt. The bolt locks into the receiver.
Most models have a detachable magazine, and have a special form of locking to hinder unintentional release of the magazine.[14] Some models instead have a hinged bottom metal. All types of magazines are double stack with staggered feed, which enables filling of the magazine while it is attached to the firearm.
Barrel
The factory barrel is either stainless or blued depending on the receiver. The action threads are imperial with 1"-16 TPI threads (in metric designation M25.4 x 1.588 mm). All factory barrels for Sako 85 are cold hammer forged, and can be delivered in various lengths, profiles and rifling twists, with or without iron sights, and either with a matte or polished finish.