GG&&G Manual Flip Up Front Sight For Tactical Forearm This GG&G Flip up front sight provides you with an easy to install and easy to operate flip up front sight that is at the correct height when mounted on most tactical forearms or dovetailed railed gas blocks at the same height as a flat top upper receiver. Once it is in the up position it cannot be placed in the down position without pressing the locking detent button located on the left side of the sight. Made in the U.S.A. MSRP $89.95