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You can get tightbore barrels for them.
VSR-10 barrels will also work
(VSR-10 G-spec tightbore will be covered up by the silencer)
But I'd be careful... with a longer barrel you'll most likely go over the indoor FPS limit.
You don't need a metal slide, there are some rare external upgrades (I have access to them too if you're interested) (It'll allow you to mount a red dot sight on it)
If anything I'd change the hopup rubber to a firefly soft rubber... other than that, the gun's perfect.
:P You really should just PM me these questions, I've owned 3 MK23's and they're one of my favorite guns.
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