Some people prefer a shoulder stock for its mobility and portability. You can sling such a device over your shoulder for easy carrying and you can use it much quicker than setting up a tripod. Using a stock, your scope is only as steady as your arm and your arm will get tired fairly quickly. You also want to be careful in using anything that resembles a firearm in certain areas. Although stocks are fairly simple to manufacture from a rifle stock and some miscellaneous hardware, there are several commercial manufacturers.
Several manufacturers make scope mounts that slide over and fasten to a car window.
These are useful for birding impoundments and fields accessible by car. See the Dec 1992 Birding for more details. Permission is granted to make single fair use copies for personal use as long as this copyright statement remains with the copy. Any other uses or reproduction of the material in this document is forbidden without express written consent from the author.