I bought a used TRG 22 in 308 about three years ago. Black stock, blued barrel, no bipod. Bought a bipod, SPUHR mount, slapped my Steiner M5Xi on it and rolled with it.
Over these years I tested a bunch of muzzle brakes, suppressors, slings and even a full aluminium chassis.
This chassis is called Pautac. Made in Finland, folding stock over the bolt, monolithic top rail. It was awesome for prone shooting, but the sharp edges around the magwell were uncomfortable, the stock hinge broke twice and aluminum is cold as hell to carry around in winter months. I think they discontinued it too.
Aluminium chassis´looks cool but they are not my jam so I went back to factory stock and eventually got a factory folder for it.
I´m very pleased for the rifle as it is now. I like the quick adjustments on the stock, because I use them when I shoot from different positions. Shoots good with factory Lapua 175gr Scenar L. Haven´t bothered to hand load for it, because I might swap the barrel to 6,5 at some point and the Lapua factory load groups under .5 MOA if I do my part.