KRG Bravo chassis LH mod help

[Kbl3509]

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.

 

[Txhillbilly]

Sandpaper or a fine grit diamond file.

 

[Joeydias3]

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.