Which description accurately summarizes how a gas-operated, magazine-fed rifle cycles using gas pressure?

Which description accurately summarizes how a gas-operated, magazine-fed rifle cycles using gas pressure?

• A. Gas from the barrel is diverted to drive a piston or gas key which cycles the bolt carrier rearward; this action ejects the spent case and chambers a new round as the bolt returns forward.
• B. Gas from the barrel is diverted to slow the bolt so it only cycles after a manual trigger pull.
• C. The bolt is cycled purely by recoil without any gas involvement.
• D. Firing the round causes the extractor to mechanically push the next round into the chamber.

Answer: (A)

Gas pressure powers the action by diverting some of the hot propellant gas from the barrel to drive the bolt carrier. This gas-driven motion rearwards cycles the bolt, ejecting the spent case and unlocking the action. As the bolt carrier returns forward under spring power, it chambers a fresh round from the magazine and locks the bolt in place for the next shot. In this system, the sequence—gas-driven rearward movement, extraction and ejection, forward chambering, and locking—happens automatically after each trigger pull. This differs from a setup that merely slows the bolt until you manually pull the trigger, and from designs that use recoil alone without gas involvement. It also isn’t the extractor pushing the next round into the chamber, since the magazine feeds the round and the bolt handles feeding as it closes.

Gas pressure powers the action by diverting some of the hot propellant gas from the barrel to drive the bolt carrier. This gas-driven motion rearwards cycles the bolt, ejecting the spent case and unlocking the action. As the bolt carrier returns forward under spring power, it chambers a fresh round from the magazine and locks the bolt in place for the next shot. In this system, the sequence—gas-driven rearward movement, extraction and ejection, forward chambering, and locking—happens automatically after each trigger pull.

This differs from a setup that merely slows the bolt until you manually pull the trigger, and from designs that use recoil alone without gas involvement. It also isn’t the extractor pushing the next round into the chamber, since the magazine feeds the round and the bolt handles feeding as it closes.