Sand-colored box AN/PEQ 16 with storage space for small battery, but also serves as an aesthetic complement (imitation laser markers). The plastic box is mounted on 20 mm RIS rail on the handguard. Including a central part of the extension, with which you can insert eg. Battery Mini 8.4V/1600mAh Li-Pol or the same size. The outer dimensions of the plastic box are approximately 13 (+2.7 extension)x7 cm.