For stocks on a budget I would also look at the Bell & Carlson Medalist series.
Yes, you can convert a blind mag to a detachable mag - but there's not really a way to do that "economically". The best way for me is to order a stock that is already inlet for the bottom metal of choice. Most (if not all) chassis systems are set up for detachable mags and accepts AI mags. These are not inexpensive, though - starting in the $500 USD range.
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