This will convert your Bottom metal to take AI mags. This has the setup for bottom bolt release. This is probably the best bottom metal out there for the bottom bolt release.
140 shipped
http://pacifictoolandgauge.com/sava...e-with_bolt_release/1196-choose_magazine-none
140 shipped
http://pacifictoolandgauge.com/sava...e-with_bolt_release/1196-choose_magazine-none