I guess you could get any old bolt action rifle that's VSR/APS-2 compatible, but you will need to fix it sooner or later.
But why on earth use an airsoft gun for target shooting if you don't plan to actually play the game?
Like I said before, airsoft will absolutely NEVER beat a pellet gun as they were designed to be shot at people without seriously injuring the person, therefore they have many severe drawbacks.
And, the majority of airsoft guns are as loud or louder than a C02 or air powered pellet gun with a diy or purchased suppressor, so your whole neighbor thing doesn't really make sense.
Also, don't shoot at animals unless you know you can instantly kill them with one shot, as that is quite cruel to not do that, if that was your intent.