You can get this into a 2k map easily. You basically have everything in 1/4th's and can easily overlap. Great work on the high poly. I'd keep in mind where you sculpt as you may need to only sculpt one element of the weapon especially in areas of uv overlaps. Just be cautious of repetitive details. Nice work!
I'd hit it... err I mean I really really like it nice work =P I agree with bbob, there is a lot UV space you could free up. Potentially keeping the pixel density the same but probably reducing your texture down to 1/4th of what you have now. Meaning bigger pieces on a smaller sheet. OR keep the sheet size the same and pick…