Gg&g gas block w/front flip up sight - GG&G Bolt On Flip Up Front Sights

I purchased this gas block mounted flip up sight for my OCR M-4. Wanted a good reliable backup ironsight, that could be stowed away while using an Eotech primary sight. Since my OCR gas block had no provisions for mounting a fixed sight, this was the best of both worlds. Excellent piece, high quality..... locks tight with no movement at all as advertised. Cheaper brands I looked at were not as well built and were sloppy with a lot of play when locked in the upright shooting position. If you want a solid reliable gas block mounted flip sight, look no further for the money.