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the bolt scratching is normal unless there are burrs on it. You can polish the bolt with some 660 grit sandpaper to take the sractches out.
Most every problem with a stacked tube blowback marker tends to deal with o-rings. Try removing the o-rings from the bolt, striker and valve and inspect them carefully. Recocking issues tends to be a loss of air pressure from the valve o-rings leaking, or the bolt o-rings leaking. Inspect the o-rings and replace them if needed. Also, when reassembling your marker make sure to coat the orings with a good air tool oil or dow 33 grease and that may solve your problem.
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