Using third-party controller modifications, Apex Legends players can push the R-301 Carbine to fire faster using its semi-automatic firing mode than in its fully automatic firing mode.
Apex Legends player u/albertobgg posted footage of a recent in-game encounter to the game's subreddit, showing an enemy player firing an R-301 faster than they thought was possible. They may have thought the other player was hacking, but commenters on the post had a more likely theory.
"Strikepack," said u/Powerful-Process, referring to a popular controller mod brand. A player using this mod can spam a single button as fast as the game can possibly interpret the inputs. When applied to a weapon firing semi-automatically, this means they can push the fire rate to otherwise impossible heights — especially when there's no cap on the semi-automatic fire rate. The R-301 has no such cap, limiting its semi-automatic fire rate only according to how quickly a player can input shots.
The R-301 isn't unique in having no cap on its semi-automatic fire rate. Many of Apex Legends' single-shot weapons can be exploited in the same way including the G7, Hemlock and Flatline.
Although Respawn Entertainment banned the use of Strikepacks at its official Apex Legends competition series, the ALGS, but it's not clear whether using one in matchmaking is a ban-worthy offense.