Blasters3D Proctor Barrel Mod with Top Picatinny Rail for Zombie Strike HammerShot - Slide On Friction Fit - No Need for Tools nor Glue Johnny English The barrel adapter is a

The barrel adapter is a tight fit on the pistol receiver

Original designs made available via Creative Commons - Attribution - Share Alike license here:

There is a "BB FPS Converter" app for Android phone that you can use to convert the speed for higher weight BB's

ie=UTF8&tag=airpower3d-20&linkCode=as2&camp=1789&creative=9325&creativeASIN=B0812GHR5Z

Blasters3D can even turn our muzzle devices into barrel extensions

Blasters3D Proctor Barrel Mod with Top Picatinny Rail for Zombie Strike HammerShot - Slide On Friction Fit - No Need for Tools nor Glue Johnny English The barrel adapter is aThis product is made to order. Ready to ship in 13 business days. This Blasters3D product is a barrel that attaches to the front of your Nerf Zombie Strike HammerShot blaster. It has a full length top Picatinny rail for your accessories. A front iron sight with built in rear co witness allow you to fire on target at all times. Its slip on friction fit design provides a tight fit to the top front side of the HammerShot. No tools nor adhesive required