A review of the SA Prime SA-PJ04 AEG from the Specna Arms SA Prime AK (J Series), in this ASG Olsztyn episode. This AEG looks to feature high-end internals including a Gate Aster SE electronic unit, a Dark Matter brushless motor, and a fully-sealed aluminum pneumatic set with a stainless steel barrel. Whilst the external construction is an improvement over the EDGE series, it uses less steel on certain parts compared to high-end rivals like E&L or LCT.