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Recently purchased a M1A Loaded. Installed Badace Tactical Scope Mount along with Leupold Optics. Was shooting 1.5 inch groups at 100 yards. Replaced Stock with Archangel Stock along with shimming the gas cylinder . I did discover issues with Stock. had to shim trigger assembly at narrow end close to pistol grip using .030 shim . Contacted Promag industries about issue but never heard anything back. Anyway Gun now shoots well under 1 inch groups at 100. The factory stock is .075 thicker at seat for trigger . The Archangel Stock installed without shim causes bolt to ride on hammer very hard. Just a heads up if anyone has issues with these stocks but fitted correctly they work very well.