Magpul MBUS Flip-Up Backup Sights Description The MBUS (Magpul Back-Up Sight) is a low-cost, color injection molded, folding back-up sight. The MBUS Front Sight is adjustable for elevation and fits most 1913 Picatinny-railed hand guards. Made in U.S.A. Impact resistant polymer construction provides light weight and resists operational abuse. Spring- loaded flip up sight easily activated from either side or by pressing the top. Detent and spring pressure keeps sight erect but allows for unobstructed folding under impact, etc. Clamps to most any MIL-STD-1913 Picatinny/STANAG 4694 railed hand guards and provides the same height-over-bore as standard A2 irons. Protective wings shield the spring-locking A2 front sight post. Elevation adjustment tool included, but most aftermarket A2 front sight adjustment tools may be used as well. NOTE: Cannot be mounted to a railed gas block due to excess heat issues. Front MBUS must be mounted to a railed fore end on the same plane as the receiver rail. Because of this the sight is also not compatible with MOE Hand Guards. Features: Impact resistant polymer construction provides light weight and resists operational abuse Spring-loaded flip up sight easily activated from either side or by pressing the top Detent and spring pressure keeps sight erect but allows for unobstructed folding under impact, etc. Clamps to most any MIL-STD-1913 Picatinny/STANAG 4694 rail and provides the same height-over-bore as standard A2 irons Protective wings shield the spring-locking A2 front sight post; Elevation adjustment tool included, but most aftermarket A2 front sight adjustment tools may be used as well Product Details: Brand: Magpul Color: Flat Dark Earth Style: Rear Sight Sport: Hunting Item Weight: 1.3 Ounces Material: Polymer Magnification Minimum: 1 x Compatible Devices: Picatinny Mount Mounting Type: Picatinny Mount Night vision: No Brand: ‎Magpul Color: ‎Flat Dark Earth Style: ‎Rear Sight Sport: ‎Hunting Item Weight: ‎1.3 Ounces Material: ‎Polymer Magnification Minimum: ‎1 x Compatible Devices: ‎Picatinny Mount Mounting Type: ‎Picatinny Mount Night vision: ‎No Item Package Dimensions L x W x H: ‎7.36 x 4.13 x 0.75 inches Package Weight: ‎0.05 Kilograms Item Dimensions LxWxH: ‎7.5 x 1 x 4.25 inches Brand Name: ‎Magpul Model Name: ‎MBUS Flip-Up Backup Sights Suggested Users: ‎unisex-adult Number of Items: ‎1 Manufacturer: ‎Magpul Industries Corp. Part Number: ‎MAG248-FDE Model Year: ‎2012 Included Components: ‎Magpul MBUS Flip-Up Backup Sights, Flat Dark Earth, Rear Sight Size: ‎One Size Date First Available: August 11, 2009