Besides Hammerdown, Wolff Springs' site lists the standard as 23 pounds, among other people & places that agree.
Re S&W, Colt isn't entirely alone in CS info (or lack of it).
I've gotten bad info, incomplete info, and no info at all from S&W on phonecalls, including one part order they put through complete with credit card info that never showed up. The part was apparently out of production when they let me order it.
Ruger will be vague at times, too.
It's an unfortunate situation that seems to be spreading through the industry, and it's sad that you can no longer call a maker up and get help over the phone on simple questions about their own products.
But, it's not just Colt, and I no longer expect any real knowledge from anybody who answers a CS number for a gunmaker.
Many times they don't have a clue, other times the legal department won't let them go any farther than "Send it in".
I'm pleasantly surprised when a call-taker actually does know the answer to my questions.
Denis