Gear: Mizuno JPX 923 Hot Metal, 923 Hot Metal Pro, 923 Hot Metal HL irons Price: $137.50 each Available: Oct. 13 (available for pre-sale Sept. 23) Specs: Cast nickel chromoly heads. Hot Metal, 4-LW; Hot Metal Pro, 4-LW; Hot Metal HL, 5-SW. Who it’s for: Golfers who want the looks and feel of better-player’s irons but need distance enhancement, forgiveness and spin. The Skinny: The three JPX 923 Hot Metal irons were designed to cosmetically mix and match seamlessly so golfers and fitters can blend clubs to make a set. The offset and sizes vary, but all three have thin,…