I saw that on OZnerf. I run into the same issues, which is actually why I used a 1" cross (I originally meant to use a 1.25" cross, but couldn't find one). You should try to add a stock to yours; there's nothing inherently wrong with my prototype design, but it really helps to have a stock. The bow arms are a little too close for comfort otherwise.
Also: are you left-handed? The blaster in the video looks like it's made for a lefty. Langley would be pleased. He gets all pissy because I make these non-ambidextrous blasters which he is incapable of operating.
Nah, I'm a righty, though my dad is a lefty. It's probably just the camera on my macbook flipping the picture around. One possibility for a stock addition would be to add two tees either side of the bow arms, and then making a "U" shaped stock, which should be solid enough, though I like it the way it is now.
While I realise that the gameplay culture differences between Australia and the US/Canada are rather large, range restrictions aren't that hard to enforce/set.
For example, here in Western Australia, we have been running wars with 100+ft blasters, enforcing a minimum engagement distance with primaries at 30ft. While our darts are arguably "safer" for impacts, we have found that this minimum engagement distance is easy to enforce/recognise, has reduced any possible close range injuries, and also injects a bit of strategy into the gameplay, where you have the ability to exploit someone reloading with a quick pistol rush. If someone breaks these rules, we then "penalise" the player appropriately, either through making them sit a round out, or with a close range firing squad.