I'm not sure I understand your question. Are you referring to the stocks those companies use for their rifles, or do you want to know something else? If you are interested in their rifle stocks, both companies use wood and synthetic/composite materials. Rifle makers offer a given stock type based on many factors: price point, customer feedback, style, operational environment--the list is extensive. Neither company actually makes their stocks, these days; they are provided by third-party vendors. The main things to consider when you shop for a rifle are, first and foremost: is the basic rifle chassis (receiver and barrel) well made and then, does the furniture (stock) meet your needs. A stock should fit you well, fit the rifle well, and fit into the operational environment you plan to hunt in. Synthetic stocks have come a long way in the last twenty years, or so. They resist, or prevent, a rifle from losing its zero due to temperature and humidity changes. Some people don't like the esthetics, but I'm a form follows function guy, and appearance is secondary to performance for me. Also, a serious hunting gun takes quite a pounding in the field season after season, and I don't want a stock I'll cry over if it gets a few nicks in it.