In 2018 Sako introduced the TRG-22 A1 and TRG-42 A1 models. The TRG A1 models have a Sako TRG M10 Sniper Weapon System alike stock, featuring an aluminium middle chassis frame, side-folding buttstock, and a fore-end with the M-LOK rail interface system that allows for direct accessory attachment onto "negative space" (hollow slot) mounting points. The TRG A1 models do not offer the user configurable multi calibre modular system of the Sako TRG M10 Sniper Weapon System. The bolts of the TRG A1 models all feature double plunger ejectors introduced earlier for the .338 Lapua Magnum TRG-42 and the TRG-22 A1 model expands the chambering palette with 6.5mm Creedmoor.