A very disappointing first "crunch" product for SR5, Gun Heaven 3 combines possibly the three worst things one could in a "gun book" - boring weapons, many of which seem to serve no definable purpose (not even in world-building), inconsistent, frequently poor art (much of it barely counting as art - i.e. basically lazy photoshops of photographs of real world guns, which look wildly out-of-place - one could at least photoshop an 2075-era scope onto them!), and to cap everything off, awful balance, with some weapons just ridiculously all-round better than others for no apparent reason (their prices are higher but gun prices in SR are so low that's not a balance factor - especially when they have a very easy availability rating). Some of the ideas, like modernized versions of classic guns, are fine, but the implementation and art are deeply uninspiring.
Bonus annoyance points for including modifications which aren't described but allegedly will be in Run & Gun, so which serve no function at this time.
[2 of 5 Stars!]