Striker set was in the rewards track. Now there are a couple gear sets locked behind the raid. I can’t remember at the moment. The crafting station will let you know which ones. Some say can be rewarded from control points or other world activities then 3 are unlocked by dark hours which is the raid along with the eagle bearer assault rifle.
From what I saw during my time playing through the season track, the only way I saw you could complete it was through finding it in the Season Item Caches that were handed out to you during the season.
Beyond that I'm not sure if there is another way to get them. The set seems most geared towards PVP, so maybe DZ caches, DZ loot or even Conflict caches could give them to you? Not really into PVP so don't quote me on this.
items 11 to 18 were the gear set corruption. Sorry. Was a long time ago.
But I did get mine but if they were crap rolls I got rid of it like anything else useless. Could you have done the same thing? Possibly?
Personally I do not like ANY gear sets because at the end of the day you lose/sacrifice attributes when wearing them and the “perks” do not make up for this fact when compared to other brands or sets even single items from a set can have more of an impact that 2 or 3 pieces of a gear set.
Plus the non gear set items drop more often so you have a way better chance of getting higher or even god roll items or double or triple god roll items plus you can use any talent in the game on a regular brand set. Up to 75% more damage per hit if you use the right talents and up to 72% crit damage and 36% crit chance from standard gear even more if you factor in weapon mods and even more if you count brand sets. But I am talking attributes alone.
If you are wanting to do “max” damage gear sets are not the way to go. Just like using exotics aren’t the way to go. They aren’t the best in the game. Only there to change play style. Nothing more.