I did not do as much customization of my Defender, but I did a "bunch". All the work was done by Novaks in West Viginia. I highly recommend their workmanship and quality.
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The work done included:
Crown Barrel
Replace All Springs (Recoil, Firing Pin, Main, Sear, & Plunger Tube Springs)
Novak Front and Rear Sight
N.M. Barrel Bushing
Carry Bevel Treatment
Novak Hammer Kit (Cmdr Style Hammer)
Fit Extended Beavertail Grip Safety
Fit Aluminum Trigger
Bevel Magazine Well
Bead blast upper slide surfaces
High Cut and Checker Front Strap 20x20 Lpi
Lower & Scallop Ejection Port
Refinish frame, anodized black