Rifle sound effect work splits into two camps. There is the impact crack that a viewer interprets as the shot, and there is the mechanical detail before and after — the bolt action, the magazine seat, the casing hitting the floor — that sells the weapon as a physical object rather than a sample. Both have to be in the edit or nothing reads as real.
You will find 97 rifle sound on this page, ranging from sniper shot cracks and single bolt-action fires to assault rifle sound effect bursts and suppressed pops with the proper subsonic tail. Game audio designers and film foley artists reach for these regularly. Free MP3 download, no signup, ready for a session.