New units often arrive packed with "Cosmoline" or heavy shipping grease that must be thoroughly cleaned before first use to prevent jamming.

Consider upgrading the hop-up system with a high-quality hop-up unit or a more efficient hop-up chamber.

Q: What is the most common problem with the Centurion BP-12? A: The most common problem with the Centurion BP-12 is jamming and failure to feed, often caused by a dirty or fouled barrel and chamber.