If you really do plan on using your pistol as a primary, I would strongly suggest to not get a compact pistol. In term of pistol accuracy, an extra inch of barrel makes a HUGE difference. If you really want a USP, look at the KSC/KWA USP tactical, they are easier to find and will serve you much better as a primary. Alternatively, look at the Tokyo Marui USP AEP (electric pistol), its accuracy is amazing, though its power is low (~220fps), but it still works very well as a primary in CQB.
If you decided to forget about the idea of using a pistol as a primary, then a compact pistol is a good backup, and KSC is a very good brand.
Keep quiet. Sound travels faster than BBs.
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