AR-GEAR Pro Series Tactical Rear Stealth Black Automatic Deploy Weaver/Picatinny Flip Up Backup AR15/M16/M4 Flattop Back Up Polymer Iron Sight Mount Push Button Automatic Deploy Flip-Up Rear Sight Towers Complete with A2 Square Post Assembly with Locking Retention and Precision Adjustments for Greater Accuracy. Color - Black. Mounting Decks Designed to be Used with Handguard & Flattop Rails and Both Will Fit All 7/8" Picatinny/Weaver Style Rails. QD Automatic Flip Up Deploy Button Release At The Push Of A Finger And Locks In Place When Deployed Or Folded. Easy Quick And Secure Installation -Allen Screw Locking Clamp Rail Base Retention For Maintaning Zero Under Heavy Conditions. Solid Highly Detailed Construction To Stand All Conditions, Designed for Shooters !