new to gas powered bb pistols; saw a used one at a pawn shop for $10; had one mag;
gal said they tested it & it shot; if any seals leak, how hard are they to replace/fix?

is there such a thing as refillable gas cartridges?

would use for training & plinking; for a well maintained gun, what's the average
accurate range?  thanks

For $10 you really cannot go too wrong on this.  However, for the most part, Umerex stuff is not what I would consider quality stuff.  As such, things like parts or seals are not going to available from normal airgun vendors.  You may be able to find what size seal, screw, pin, etc. that Umerex has sourced out from their manufacturing vendors; they don't make their own guns. But, this will take some research on your part.

The thing will be just a bb gun, albeit a little bit better than those you had as a kid. The market for these kinds of guns are for those who cannot (or are not willing) to own actual firearms, and for those who wish to have a good replica of their firearm for close indoor practice.  The accuracy will not be that of your regular pistol.  But for "social" distances this is really not much of a problem.

These guns use the small CO₂ cartridges.  There is no easy way to fill these.  Bulk filling is relegated to the bigger pistols with long air tubes and rifles.

thanks