Two charging handles to accommodate various iron sights including suppressor height sights up to 1.1 - Compatible with compensator/suppressor up to 1.38 in diameter - No pistol disassembly required---just place pistol into the kit lock and go - Ergonomic Finger Groove Grip for more stability - Aluminum top Picatinny rail for increased durability and accuracy - Compatible with our MCK Brass Catcher - Ambidextrous for fast and easy handling - Right-folding stock/arm brace for easy concealment and carry locks and shoots from the folded position - In place of the under-chassis mag carrier the MCKGEN2 for the G20/21 comes with a Mag Carrier that attaches to either side Picatinny rail and also serves as thumb rests. This feature makes reloads faster to both right & left handed shooters.