Visible gap in between hand and repeater rifles. How do I go about adjusting the grip?

[mkvamm1]

http://i.imgur.com/KnMyxLl.jpg

 

This is annyoing me, not a huge problem, but I'd still liked it fixed. How do I go about re-adjusting the grip on repeaters? It's even more visible in third person too but that not such a huge problem.