RPS MURDER MAGAZINE SPRINGS FOR MID-CAPS WITH FOLLOWERS - 3 PACK RPS Replacement Murder Springs for Mid-Caps with Followers - 3 Pack Great for reliable feeding in RPS builds and when using heavyweight BBs or both. Includes the following: 3 - Heavyweight Springs found in Murder Mags 3 - Unique Shaped follower that allows smooth BB feeding and turning through curves of magazines. Murder Mag Spring and followers are replacements for Murder Mags but are used commonly as replacements for other Mid Cap magazines. Very common to replace ARP9 Magazines and Hi Capa magazine springs. (Some modification required in some applications. For Hi Capas, use stock follower). Tags: Murder Mags Murder Mag RPS Murder Mags Round per second Rounds per sec Rounds per seconds Murder Mag Spring