Are you 21 or older?
RRA NSP Flip-Up Front and Rear Sights
Magpul MBUS Pro Flip-Up Front and Rear Sights
A.R.M.S. Flip-Up Front and Rear Sights
Midwest Industries Flip-Up Front and Rear Sights
Troy Battlesight Micro Sight Set
Samson Quick Flip Folding Front Sight