It is not stainless. The magazine appears to be true a bolt mag. The lip in front which is towards the barrel is catching up, followed by the curved ends in the back of the mag.
If it is a stainless gun, they were built on a long action stock which may affect which mag you use. I thought I was buying a true short action, but it's a short action with like a barrel spacer and used a long action synthetic stock.
