Fortunately, you've joined the Axis crowd when there are a number of options out there!
The first and most common option is to trim some amount (usually 0.5 to 1.5 coils) from the trigger spring. It won't address grittiness, but it may make it more manageable. An alternative is to replace the factory trigger spring with a lighter spring from a hardware store and a 10-24 screw to hold it in place. This does double duty by offering an adjustable overtravel stop.
To clean up the break by removing creep, my preference is to shim the trigger under the sear. I made a video on my method. It's a reasonably safe and accessible way of refining the trigger without dishing out money for an aftermarket part.
Speaking of aftermarket parts, both Timney and Rifle Basix make replacement triggers for the Axis. I have both and have nothing bad to say about either. If you want a recommendation, I'd go with the Rifle Basix Sav-1. I like the overtravel stop and lower price.
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