FX Ordered an FX Impact M4 .30 cal Copper 600mm, now what?

I currently have a Leshiy 2 Sparrow and it's been great with slugs. For the M4 I did get the FX slug liner kit, looking for a scope now and also ordered a DonnyFL Ronin.

What other mods have you done to your M4 or M3 to make it perform better, this will be shooting under 100 yards and used for varmints etc.
under 100 you could get away with the Athlon Midas BTR 2.5-15x50. Its a very nice and clear scope, I'm sure there are many others. Ithats one I have experience with. You can spend a lot more if you're looking for more magnification.
 
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Why did you order a Ronin? The stock moderator actually works quite well. The only thing I've added to mine is the Saber Tactical lower picatinny rail. Other than that, it performs very well!
Did they change the mod on the m4. .30cal the fx mod is garbage over 50fpe. Why have a 30 if not near 100fpe and quiet? Ronin is a good choice for .30.