Metalhead figures from the Nickelodeon TMNT line have been recently showing up in the UK.
However, it would seem this UK release has been altered.
The right hand gimmick on Metalhead which bears a hole for the missile accessory has been filled in. This has made the missile included with the figure a redundant accessory.
Posted are comparison photos, one of my own American released Metalhead (left) and the UK release (right) courtesy of Kingoji. You can also read Kingojis customer review on Amazon UK here. The review also explains why the hand in the UK Metalhead photo is broken.