KRG Bravo chassis LH mod help

Kbl3509

Private
Minuteman
Aug 14, 2019
32
7
I have a KRG Bravo chassis with a Big Horn Action. It has been modified to accept the left handed action. I have posted pics of the cut out part. My question is what can I do to smooth out the stock material to make it look a little bit better? I am also using AI magazines and it is pretty rough trying to chamber a round. It’s like the feed lips are too tight to begin with then when the round hits the feed ramp you really have to apply some pressure chambering that round.
 

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Sandpaper. Start with 220 grit and work your way up. I do my own stippling, and with under cuts I’ll take it all the way up to 1200 grit. Takes time, but works well.