I don't like the tactical stuff at all, form following function can be OK, but let's not beat the poor thing with the triple ugly stick.
I like the integration of the air bottle as a butt stock and or the forend for that matter. Can we do a better job of making it look like a rifle stock? The basic shape of the butt is an oval cross section, not as inherently strong versus round, however the shape can work with good engineering. Polymer based stocks offer many advantages over classic wood and can look identical surface finish wise. Steyer makes a modern sporting rifle called an AUG that is beautifully integrated design wise, easy handling via a bullpup design and integrated scope that doubles as a carry handle. Point is, it is a 30+ year old design, yet looks like it could have been designed last week. So many of our "modern" PCP rifles look more like a rapid unscheduled disassembly of a hardware store. Not so modern either, Clark packed a Giradoni PCP rifle way back in 1804 to impress the natives. It was a PCP, it was not called that. The journals refer to Clark's air rifle.