You already have most of the parts too do what you want. There's a 90 degree angle bracket the holds the rear of the blind magazine in the stock. This is sandwiched between the front action hole/action and the stock. The bottom cap just clips on the blind magazine/spring follower assembly so if you squeeze the sides it will come off. You will need a different stock as your present stock is inletted for the bottom metal of the DBM. There are no holes too drill if you get the correct stock for your SA.