I also run a M&P Pro 40 5" - Limited
SSS ESP Brass Mag well - 3.7 ounces
SSS Tungsten Guide rod with 14lb Wolff spring
Custom trigger job by Pedro Ortiz - 3lbs, less take up, very little over travel and short reset
Taran Tactical mag bases
Costa Catalyst mag release
Apex extractor
Heinie Ledge Sights