My local gun guy smoothed up the stock trigger on my Spikes Tactical M4gery. Works fine. I use an EOTech sight, Magpul BUIS, a single point sling, tritium front sight, and have a Surefire X300 light. I load the Winchester 64 grain SP for HD purposes.
I seriously doubt I will be heading off to man the barricades, but for a HD weapon, it will do the job.
Be careful with that monkey'd trigger... ARS are not the type to mess with. Though depending on what he did it may be fine for its life. Folks can mess them up really quickly.
And for 62 bucks generally on sale, the RRA varmint, it makes NO sense dollars or common to monkey with an AR trigger, even on a budget. Not on a budget you get even more choices....
