I'm working on getting this one too but from what I can see, while it's nice having an actually completely free combat bonus that also looks pretty sweet as an Engi, it's still only useful outside of instances and a minor bonus at best. The craftable constructs aren't sellable so there's no way to recoup the costs of crafting this too. Another one I'd recommend against, unless you like having the mech guardians.
After the reload, you can set up the actual sniper operation. Under TSM -> Operations -> Sniper, create a new sniper operation. You can name it what ever you want. In the options for this operation, you can change the Maximum Auction Price setting to one of these two strings (I will explain the differences between the two strins in the following section). Make sure to hit enter to save your changes.

**Players can repeat the Battle for Azeroth trial experience with up to 12 characters per qualifying account during the welcome back weekend. The Battle for Azeroth trial experience ends after three hours of game play in Battle for Azeroth, or after the quest "We Need Each Other" (for Horde) or "A Nation Divided" (for Alliance), whichever comes first.