Some in package and internal pics:
https://www.reddit.com/r/Nerf/comments/n8hr3n/fortnite_6sh/>UK Amazon had a couple up, arrived 2 days early, which was nice. Out of the box it's getting average Hammershot performance of 60-70 fps (Nerf ChronoBarrel used for the test without the barrel extension on). Grip is comfortable, but some may find the hammer a bit of a reach to pull back. Barrel extension is as reported not attached and the points that make it a permanent piece are easily filed downable. Blaster comes apart easily with no plastic welds or clips, there are 3 screws along the thin seam below the cylinder that are about 2mm shorter than those in the rest of the blaster. Grip plates and barrel lug can be easily removed once the blaster is dissembled and the lug piece looks like an easy 3d design to replace it with one with a normal non permanent extension lug. Doing the same to the end piece of the extension will be a bit harder but looks entirely possible. 