Which characteristics are similar in both tilting- and rotating bolt gas operation firearms?

Both tilting and rotating bolt gas-operated firearms share the characteristic of utilizing a locking breech mechanism. In these designs, the bolt locks into the barrel or receiver, preventing any movement until the pressure in the chamber has decreased sufficiently after firing. This essential feature enhances safety and ensures reliable operation by keeping the action secure during firing, thus preventing the cartridge case from being expelled before the gases have had a chance to safely exit the system.

In contrast, other options such as the ignition method or the type of action utilized do not apply uniformly to both systems. For example, not all firearms with a locking breech utilize the same ignition system, as some may use hammer-fired mechanisms while others may rely on striker-fired designs. Lastly, the classification of single-shot firearms does not apply to either of these systems, as both tilting and rotating bolt designs can accommodate multiple rounds within a magazine.