Classic Army Sportline M15A4 Carbine.

 This is an entry level airsoft from Classic Army, which I believe is made in Hong Kong. The receiver is made of plastic. Gearbox is metal but is rated only to 200fps.

Fully compatible for upgrade to metal parts and power up.

 Nice piece of kit. Easy to carry but since it is made of plastic, upgrade to metal parts would be inevitable for battle readiness.