Evike have posted a review of the EMG Kel-Tec RDB17. Now to be fair EMG is their own brand and they are a retailer, that’s not a suggestion of any issue just keeping things open! The EMG branded RDB17 is made by ARES so you know where the quality comes from and the licensing and legalised markings are via Evike.
Kel-Tec’s products (and their replicas) are often a diversion from accepted conventional design and quite desirable. In the case of an Airsoft AEG, bullpup designs make a heap of sense.
The RDB17 is due out at the end of March and currently on pre-order fr 319USD.