Not sure what HBB airsoft is, do you have the acronym correct. I know that GBB stands for Gas Blowback.
Hacker B&B
chromosome 11
Hbb
weather
Hbb.,bj
hbb
Airsoft GI
evike, airsoft megastore, airsoft gi
airsplat, airsoft arms, airsoft megastore
you can get them on youtube and other places but they will be used so i suggest you buy it
Amazon Try an actual site that sells only airsoft like Evike, Airsoft GI, and Airsoft Club.
All airsoft can jam. Phrase your question better. Such as Does blowback airsoft jam more than spring airsoft?