What a really inexpensive way to make a solid blaster that stands out.
The part seems to work well, but their just isn't enough air volume in the hammershot to shoot very hard at all. It's just not at all practical to use.
Purchased the kit to install in my Nerf 6-SH. Had to make two slight modifications for the pieces to work: cut a bit out of the trigger well, and glued an additional piece of a metal axle into the hammer piece, so that the rotation mech would catch correctly. With these changes, the kit works excellently and looks great!
This little kit is self contained and is worth the hassle of installing. If not for just a slight power boost just to feel far more certain in operating your blaster.
P. S. It does slightly extend the hammer but still large hands required to use without shifting a lot.