My frt site is stamped ... A7I2.... Not F, this clot is an A3 flat top and I want to add BUIS . What BUIS truly works with an A3 with this frt site???? Thanks
best place to ask is AR15.Com - Your Firearm Resource. (AR-15, AR-10, M4 Carbine, M16, H&K, SIG, FNH, FAL, AK-47, 50 Cal, M1/M1A, Handgun, Pistol, Training, Hunting, and More!)