2005 heavy is believe the newest one.
Here's what I remember when I research on both guns:
USP:
*Standard Glock/ beretta Holster will work
*Less Upgrade required
*LAM/ Suppressor available to addon
*Slide is Plastic
*Green Gas
MK23:
*Desert Eagle grade holster is probably best option
*Return spring needs to upgrade unless you like to do slide release by yourself (spring is weak)
*Heavy weight, more weight realistic to it
*Metal Slide
*Green Gas
*LAM/ Suppressor available to addon
*Giant handguard (bad for those not wearing gloves, uncomfortable)
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