Solo master ops is insanely hard. I can no longer finish it. I'm 312 and combatants are 320. You should be able to level with Easy content. If I can't do it it means you need to remove the requirement. It's impossible for me I pay for the game. It's too phucking hard. I can't even complete it anymore I get one -blam!- in my master difficulty. There are many players who will not be able to handle it.
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Sounds like a build issue to me. Looking at your Warlock you have gear with 0 mod equipped and your guns have PvP perks focus. Your are certainly going in at a disadvantage if you don’t leverage abilities and build in Master. I’m 270 and I have no difficulty clearing Master content so it s not a game issue.