By a drop down mag, I assume your looking to convert the magazine to a detachable box magazine. If so, you could convert the magazine. I would send the rifle to SSS. Other members have done the conversion themselves too.
Different stocks are available for the rifle. You could get a Choate Ultimate Varmint stock for less than $200.
If you wanted to spend a little more, you could get Stockade Arms or SSS to build you a stock. A custom stock would run you about $350 after shipping, depending on the accessories and other things you wanted.
http://www.xlrindustries.com/
If you wanted a modular stock get something like this one.
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