The HGUC Jegan is from the OVA Mobile Suit Gundam: Char’s Counter Attack, which is somewhat a (non-direct) prequel to the Mobile Suit Gundam: Unicorn. A slim and basic kit and very articulated, also very minty green.
As you can see, this is a grunt/soldier unit (also the peg for the shield broke due to stress).
The usual mug shots.
According to MAHQ, this is a rounded, well-performing model that was in service for Earth Federation over 30 years (circa UC0092 – UC0123). Its economical, simple and upgradeable (the various variants of it is a testament to that).
The shield is coated with anti-beam coating that can withstand a few glancing hits, it is also equip with two missile launchers at each sides for long-ranged combat.
Quite a sleek-looking unit, this.
The backpack if you noticed is a little similar to another previous design, the RX-178. The central thruster bell can be tilted a few degrees forward and back. Actually most of the technologies used for this is a carry-over from the RX-178 and optimized for mass-production.