That is the 5-shot .357 from RGR. Recently bought one for the Mother-in-law. It is built like a tank, & seems a bit heavy compared to other similar sized revolvers. In spite of the weight, it has a stout kick when shooting magnums. Much more pleasant to shoot with .38 Specials. The gun was originally designed to shoot only .38s, but they realized the gun was strong enough for .357s. We keep the mother's loaded with .38 +p ammo.
The SP101 is an excellent gun. But if you insist on shooting .357s, and don't intend to carry it daily, you might consider the GP100. The full size gun is easier to shoot accurately with the magnums.