If you can afford it,get a PDi W hold from Xfire. It's a seriously under rated bucking,I have one in mine and performance is fantastic,25x20mm groupings at 30m! You can get two,and it will cost around 2000JPY,with express shipping. No point in getting one as you are only saving 2£.
Mine would have arrived quickly if An Post classified it as express and not regular ground but that's another story.
And get the Dangerwerx Type B arm,I heard it's a seriously magical combo with the W hold.