Nothing wrong with 20"-22" barrels. Unless you're a competition, long range benchrest shooter, or long-range hunter, longer barrels just aren't necessary.
I used to think that there was a huge cost to velocity with shorter barrels, but that old-school line of thinking just doesn't seem to hold up to reality.
Quote:
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During the development of the Tango 51, Tac Ops took a standard 26-inch barrel and cut it down to 18 inches in one-inch increments. Between 10 to 20 rounds were fired at each invrement. They found that a 20-inch barrel provides for a complete propellant burn and no velocity loss when using Federal Match 168-grain BTHP, a cartridge that has become something of a law enforcement standard. Going to an 18-inch barrel only resulted in a loss of 32 feet per second (fps).
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http://www.tacticaloperations.com/SWATbarrel/