They made a distinctivesnikt sound as they emerged, like a rifle bolt being engaged.

There was a familiar metallic sound from behind him - that of a rifle bolt being operated.

The rest of the squad fell to one knee, and I heard the smart click of rifle bolts.

A rifle bolt had suddenly slipped into place.

The click of a rifle bolt sounded clearly.

Slowly Blade put the rifle bolt down on the blanket.

The sound of the drawn rifle bolt kept recurring, getting in the way.

Below him every rider turned in his saddle, and rifle bolts clicked.

The metallic sound of rifle bolts working drifted down from above.

Katya heard the metal slap of a rifle bolt.