I wish we had clearer shots of Dengar with this weapon.
Having studied the pics I have available to paint the muzzle on my adapted gun I am beginning to think that there may be something else going on with the muzzle end of this gun other than it just looking more silver.
In GubernatorFan's pic of Dengar on the star destroyer bridge it seems possible to me that the dimensions at the muzzle of the blaster may indicate that it has a shorter, more cylindrical (rather than conical) device. It just looks a little short, and well odd to me.
This may also be evident in this pic from the same scene, especially perhaps the more straight sides of the flash hider. Not clear at all I know. Looks more silver here too
and again here. Its blurred, I know and could easily be a standard muzzle device too. Looks less silver again in this pic though.
Now I am more than happy to accept that this is an effect from lighting, or the angles at which the pics where taken or even that it is due to the fuzzy and sometimes out of focus nature of the screen grabs (why oh why did he pick up what appears to be 4-LOM's blaster for the promo pics which are by and large pin sharp lol).
However I do wonder if there is another explanation, and after some looking I have found pics of MG3s (the NATO version of the MG42) which show it being used with a different muzzle device which interestingly appears to be shorter and less conical.
This is an Austrian MG3
And a Norwegian one (less likely I think)
Interestingly both these pics seem to show some sort of brightly coloured 'practice' ammo being used with the guns (possibly plastic practice rounds??), and so I wonder if these muzzle devices are some sort of practice or blank firing muzzle break. It is interesting too that the Austrian version's muzzle device has been painted red/orange.
Is it possible that what we see on Dangers gun is one of these with the red/orange paint removed???
Its far more likely I know that its is a standard MG42 Muzzle device that was used, but perhaps this was changed to give the muzzle a different look from the similar one on the MG34 that 4-LOM has in the same scene, or perhaps someone just thought it looked more Star Wars I don't know. I don't even know if these muzzle devices are interchangeable with an MG42.
As a side note you can see that on the Norwegian MG3 the buttock has been removed for use on the vehicle mount, just like Dengar's has no butt stock.
As I said I really don't know about the muzzle it might just be me, but somehow it just looks off from a standard MG42 muzzle, although the more I look at it now the more it looks like a standard muzzle device. The low quality pictures make it very difficult to tell with any degree of certainty. I really don't know here and I am doing a lot of thinking out loud while searching for an answer that may satisfy my curiosity.