If it is for the marching arena, the American Custom series is not the way to go. Since you are a fan of the Firth line, I suggest the Corpsmasters M61. The Lexan mallets are loud, so make sure that the players wear 5-10 dB ear plugs, otherwise, damage will occur. Also, buy a few extra pairs, as the fiberglass might break in the middle of the season.
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Big John
Bullitt Central HS '99-03: Pit, Bass, Snare/SL
Univ. of Kentucky '03-04: Cymbals, Bass Nine
Southwind '04: Lead Vibes
Since 2005: I've been pursuing a career as a conductor and an operatic baritone. No joke.