Any M16 A4's or AR-15's with rail system?

Im looking for an AR15 type rifle along the lines of an M16A4, or an M4. I want it to come with rails for attachments on all four sides of the fore-stock. Preferably with an adjustable stock. I don't really want to have one built. Or can I buy a gun and change out the fore-stock to a stock with rails? If that... show more Im looking for an AR15 type rifle along the lines of an M16A4, or an M4. I want it to come with rails for attachments on all four sides of the fore-stock. Preferably with an adjustable stock. I don't really want to have one built. Or can I buy a gun and change out the fore-stock to a stock with rails? If that is the case, what do I need to do?
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