0.28g Specna Arms CORE™ BIO BBs - 3000 Pcs BBs and the standard Marui GBB

and the standard Marui GBB hop up

Polymer parts include pistol  grip side linings as well as miscellaneous internal elements

Due to the extendable stock with an anti-slip stock pad

The TM-spec construction ensures reliable operation with your Marui platform

In order to operate correctly

0.28g Specna Arms CORE™ BIO BBs - 3000 Pcs BBs and the standard Marui GBBThe diameter of a BB is 5. 95 mm (+ 0. 005mm) and the difference in weight among BBs does not exceed 0. 01 g. As a result, Specna Arms BBs work very well both with standard internal barrels as well as with precision barrels present in tuned replicas. At the final stage of production, high polish is carefully applied to every BB made by Specna Arms. Thanks to a full control over the production process, the manufacturer receives BBs with perfect shape.