Over the weekend I saw on IG that MR556A1 uppers were 20% off, so I jumped on it and bought one. I know my way around an AR, but I’m a total noob in regards to HK long guns. I know that only certain triggers are compatible with this upper. Do you guys recommend any specific brands or models? Are there any other quirks I should be aware of? Or is it pretty much plug and play like any other AR upper?
Through some of my research I’ve come across the Wilson Combat TTU-M2. Has anyone used this trigger with an MR556A1 upper and a mil spec AR15 lower?
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