At the moment they have this, the Thunder gun with underslung Flamethrower. At a pinch, you could also get away with using this as a Combi-Melta. For the sum of £5.05 you get five resin weapons. Per part, this is far cheaper than buying original parts from bits sites (which charge in the region of £2.50 per gun). So from a cost perspective, this is an effective way to fill your boots with combi-guns.
The guns feature a number of little details, including a dragons head. This generic image means it's not just a weapon for loyalists or traitors, but both. They'd fit in well in any Salamanders force, where the Dragon is iconic to their appearance.
The guns also feature a pair of rails on the topside, allowing accessories such as scopes to be added...
...These ones in fact. Coming in sets of nine for £4.33, these Reflex Scopes are a great addition to any units with a special-ops theme.
From this perspective, the guns are about equal in size to standard GW parts, which makes them ideal for this range. However, the Kromlech guns are about 50% chunkier than GW weapons, making them less suited for human-sized models.
On a Terminator they are right at home, matching the bulky exo-suit's contours perfectly.