Hyperdouraku writes about the first M4 CQB-R Blowback AEGs from Baton Airsoft. These are basically offerings to meet either the budget or high performance requirements of the airsoft player. For those on a budget, they can go for the Sportline version and those who can afford more can go for the HR (High Rate/High Cycle) version which is highly tuned to be responsive when used in airsoft games.

Read more about these here.