I think a polymer, decocker equipped, hammer fired, da/SA semi-automatic makes a great 1st. Polymer might be soulless, but it is forgiving when it comes to maintenance and lighter when it comes to carry. Consider a caliber that is inexpensive and readily available. 9mm is hard to beat.
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22lr, 20 gauge, 8mm Mauser, 35 Remington, 30-06, 5.56x45/223, 9mm, 380acp
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