This Knight’s SR-16 E3 Combat Master is a full metal constructed AEG with full markings. It is equipped with ambidextrous mag release, bolt catch and selector. The integrated bolt catch/ release system makes the hop-up adjust easily accessible. Comes with the folding front sight and free float URX rail system, which has 5 sling swivel slots on it. The body and stock also has a sling swivel slot on each side. The stock is capable to store up to a 1600mAh 12V crane stock type battery or user can use Li-ion battery and install it inside the stock pipe. Package includes a 300rds magazine, 2 panels, fore-grip, sling swivel, BB loader and user’s manual.