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midwest industries ar-15/m16 yankee hill machine ar-15/m16 double star gas block with front sight flip-up tower provides instant sight backup low-profile steel gas block with integral flipup front sight adds minimal weight and bulk to your ar-15/m16 easy bolt-on design for simple installation three hardened steel hex-head bolts clamp gas block to barrel dual ball-and-detent system locks sight tower securely in folded and deployed positions deployed height is the same as f-marked usgi front sights regulated for rifle or carbine with 16 barrel standard a2 front sight post adjusts for elevation gas ...

gg&g ar-15/m16 high standard ar-15/m16 models mad flip-up rear sight multiple-setting aperture for precise accuracy originally manufactured under contract for picatinny arsenal the mad multiple aperture device rear sight gives the tactical shooter a dependable fast-deploying back-up sight system with preset range points out to 600 yards a robust locking bar and cross-bolt clamp the mad securely to the rearmost slot in any picatinny-style flattop receiver rail rotating disc has five numbered .070 apertures preset to provide the right elevation for quick short-range engagements or precise accuracy ...