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Last I heard, the SEALS passed on the MK23 and decided to stay with the SIG P226. I guess it all depends on your definition of "use".
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Then what did they do with the 5000 guns or more importantly the 5,000,000 dollars that was going to buy them??
But seriously, I had read that the SEALs were the only ones who really liked the Mk23's. Then again they were the ones who did most of the work with HK, it was really their baby, and was one of those things that got mashed togeather when SOCOM was created. The complaints revolve around it being too bulky and heavy, once the electrics and suppressor are fitted.
The Mk 23 might have been overrun by developments. For one thing it owes its existance to the general adoption of the M4. Everyone wanted the M4, but it cannot really be suppressed. The Mk 23 was a attempt to give a silenced weapon to the teams, one that could be carried by every member in a team, and not have to leave someone stuck with a MP5SD.
Since the Mk23 was built, .300 Whisper/Fireball uppers for ARs have come out, a weapon that is not only quiet, but has a effective range that creaps very close to the unmodified M4's... The only thing lacking is that there are no pictures or documentary evidence that the .300's are in use...
What is known is that in the last year the SEALs have recieved a large order of SR-25's, now called the Mk11. Though called a sniper rifle, they also have RIS and can mount any accessory that a M16 can, including M203, and the telescopic sight has QD bases that could easily and quickly be replaced with a Reflex, besides coming with MAD and a folding front post installed. It also can be used as a quiet eliminator, that would still be a more effective choice for later in the mission, than the Mk23.