I own a Oracle and it's been very reliable and jam free. This was even before I did any Up-Grades for my personal tastes and choices. Hopefully when I get my new 1-4 Bushnell Scope for it, it will be even better.
Just remember that these are not a Mag Dump type Rifle because of the Non-Chromed Lined Barrels, but other than this, I find they work and function just fine. Just use plenty of Oil to keep the Bolt moist for best operation. Especially if you haven't builtup any backup parts.