They're essentially the new model of the p10/12. Also the base of the Diana Skyhawk.
Very well machined (internally and externally) and designed. Unfortunately some important things are of very poor quality- particularly the barrel and regulator.
The barrel is oversized and utterly horrible. The rifling starts abruptly about 5mm past the transfer port and shreds the pellet as it feeds through. Once you've fixed that, most pellets almost fall straight through they're so loose. It's a 13mm outside diameter barrel - more on that in a sec.
The reg either works well for a bit then dies, is non functional from the get go, demonstrates terrible creep or shows some combination of the those.
One other thing to note - the shroud internals are useless and guaranteed to clip eventually. Easily fixed by removing the little tin baffles with no change in report. Also, put some felt inside under the vent holes at the back of the shroud.We get aftermarket silencers that then screw directly into the shroud here that make them as quiet as any other bullpup - doubt donnyFL would struggle there.
I bought one as a gun to to tinker with having heard most of the issues from my local forum. Still sucked that they were even worse in my gun.
Nevertheless the shot cycle is excellent with absolutely no pinging or vibration. With a bit of tweaking the trigger is as good as I've felt on any bullpup and a damned sight better than my Vulcan was. The gun is exceptionally solid feeling. Also very easily stripped down for maintenance and tuning. HST is easily adjustable by a screw at the back. Well designed hammer with no issues with bounce.
In the end I replaced the barrel with a 12mm OD LW one which just happens to be one of those 'magic' barrels. Shoots sub 1/2inch at 50yards and have yet to get a flyer at 840fps with 18grain jsb. Needed to add 0.5mm brass bushings at the barrel clamps and shroud to make up the 1mm difference from the factory barrel.
Managed to fix the reg but it remained less than ideal, so now I recently put a huma in and it works perfectly.
In its current state it shoots as well as my Vulcan with a more civilized shot cycle and better trigger. Also weighs 2.7kg/6 pounds scoped with an optisan evx 10x42 as well as Tula (the locally made one I mentioned) silencer attached.
Perfect little workhorse and still significantly cheaper than most guns with comparable performance even after the extra work and components are accounted for. The nice thing about the quality of the engineering of the action etc is it is not one of those guns that feels like it's going to work well for a while after tuning and then crap out. Now it's done it is awesome and I have no doubt will stay that way.
The road to getting it to this point has been frustrating though and is definitely not for everyone. If you've got the frustration tolerance it's worth it though.