Complex sentence: The R51 comes standard with thin polymer grip panels which are held on with conventional screws, and the company plans to offer optional rubber and rosewood grip panels as accessories for users desiring a wider, more hand-filling grip.
Split into simpler sentences: The R51 comes standard with polymer grip panels which are held on with conventional screws. Remington plans to offer optional rubber and rosewood grip panels as accessories for users desiring a wider, more hand-filling grip.