- This full metal constructed AEG.

 - Accessible hop up unit make adjusting the range easily.

 - It is a 14.5 inch outer barrel tactical rifle which comes with crane stock.

 - An unique serial number and King Arms logo marking are laser engraved on the lower receiver of each rifle.

 - Mosfet assembly provides better trigger contact.

 - Package comes with 300 rounds high capacity magazine and vertical tac grip.

King Arms M4 RIS with Mosfet Advance