These give the user better stability when firing, but in general have little actual effectiveness because there is almost unnoticeable recoil. Slam fire is perhaps where they become more useful, because it reduces the strain on the user's arm from constant priming.
Interchangeable shoulder stocks
Other shoulder stocks
|Swarmfire shoulder stock||2011||Swarmfire|
|SharpFire shoulder stock||2015||SharpFire|
The following blasters are compatible with interchangeable shoulder stocks; some stocks may have difficulty working with certain blasters, however; check the shoulder stock's article to see if blaster incompatibilities have been reported.