Not entirely sure if one of the patches will fit as a drop in from the Z-kit. But if it doesn't you can sand it and cut it down to fit properly. As for airseal, the nice thing about using an R-hop/IR-hop is that you can have the advantages of a hard bucking (able to use heavier bb's because of higher fps) with the advantage of a soft bucking (better airseal). This is achieved because the patch itself acts as the hard bucking while the bucking that goes over the patch can be soft therefore giving you the airseal.