When installing the rear swivel, what is necessary to clamp the rifle?

Using a padded vise to clamp the rifle during the installation of the rear swivel is essential because it provides stability and support without damaging the firearm. The padding helps to grip the rifle securely while preventing scratches or dents that could occur with harder clamping surfaces. A padded vise also allows for precise positioning of the rifle, ensuring that the rear swivel can be installed accurately.

Other clamping devices like a standard bench clamp or a c-clamp may not provide the same level of stability or protection, as they could slip or apply uneven pressure, leading to potential damage. Meanwhile, a pipe wrench is not suitable for this task due to its design, which could easily damage the rifle's surface given its intended use for gripping and turning pipes rather than securing delicate items.