Retail price is around 25 USD.
High quality/ Low cost.
More details will be released soon.
JAG Precision has the first shipment.
247mm: G36/ P90/ CAR15/ SG552
363mm: M4/ SR16/ SG551
455mm: AK47/ AK47S
507mm: AUG/ M16A1/ M16A2/ M16 VN
590mm: PSG1
More here