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Installing the magwell:

Place the magwell on receiver and insert the alignment rod thru the magwell and factory magazine release pin holes, this helps to align magwell to gun. I notice with my gun that there was a lot of side to side movement so to help with centering I layered packing tape on each side of the mag release mount to fill the gaps. This centered the magwell nicely and helped to prevent movement for setting the location of each hole to be drilled.