It's an A3 model.
JG make it and there is an ASG rebrand with trades.
http://www.patrolbase.co.uk/airsoft-bulpup-guns/asg-steyr-aug-a3-mp-proline-tan.htm#.WqSeV3xpHZI
It's the heaviest of the aug variants, Still useable but not as pointable as the lighter ones. You need 2 allen keys to remove the RIS to remove the barrel and hop. By pointable I mean the weight distribution is further forwards, meaning you have to turn and find targets slower as the forwards weight carries more inertia and will overshoot and need pulling back on target.
There appear to be at least 2 variations on that model. Mine is an older ASG sportline (jg), The newer ASG proline might have better stock internals as its APS, the proline is also featuring a QC spring, and should have bearings (7mm).
Just be aware when you pick one up that the JG stock internals are basic unless stated otherwise.
The model I have (JG) came with nylon gearbox bushings (7mm), no QC spring, a low end motor (15rps), Stock wire with no Mosfet. Cheap spring guide (plastic).
Mine has been modified quite a lot, Silent heads, solid brass spring guide, ASG 35K motor, Gate nanohard mosfet, CNC hop, 6.03 barrel (455mm), Silver wire loom, Solid bushings. At least £150 in upgrades probably more. It does shoot well and is as durable as any other AUG model. This gun is old enough that the bushings needed replacing hence the upgrades. The CNC hop wasn't needed, and I regularly swap between it and the plastic stock one. Both hop equally well but I had money to burn.
The APS in contrast having the bearings and QC spring will not need the gearbox opening as soon. Because you can change the FPS and motor without needing to open the gearbox. You can also wire any of the V3 gearboxes to mosfets without needing to open them (the contacts are on the outside of the gearbox). It's a painless experience and there are plenty of threads regarding V3 aug mosfet installation (it's slightly different to AK's because of the double contacts). My APS gun currently has no upgrades as it's still bedding in, It shoots well, It doesn't have the RPS or silence of the upgraded gun, but the range and accuracy stock are still good.
I use a walther ps22 scope on the A3, There are many clones of that style optic, and the mount flows very nicely with near perfect angles to the ones on the gun.
I can't fault the A3 variant other than the weight, and the need for more tools to remove the inner barrel/hop. The ASG proline also has an extended inner barrel 520mm that puts it well into the under volumed region (2.01:1) for a non ported cylinder, the 509mm stock JG one is also under volumed (2.05:1)
DSC00427 by
B N, on Flickr