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Hi William and welcome. This model is MIL-SPEC 3443G, with its heavy-walled barrel, metal trigger guard and safety. It is Drilled and Tapped Receiver. Cheers and stay safe!

William, yes sir, all 590 A1's are drilled & tapped. The 590 A1 is MIL-SPEC 3443G, with its heavy-walled barrel, metal trigger guard and safety. Stay safe & have a great day!

I personally own a 590A1 and can verify that it is Drilled and tapped. I love this model as it is a Tank being a MIL-SPEC 3443G, with its heavy-walled barrel, metal trigger guard and safety.