SGM Tactical is a company founded on the belief that using modern manufacturing processes, better products could be designed. The Computer Aided Drafting systems used to create a higher quality magazine led to an ability to produce many items to a higher standard. All SGM Tactical products are manufactured in an ISO 9001:2000 approved manufacturing facility.Saiga choke tubes make your 12 gauge shotgun much more versatile. The tubes simply screw onto the muzzle threads and reduce the choke to the desired level. The black oxide coated 4150 steel is hardened to a 40 Rockwell hardness to ensure durability and years of service. Integrated threads on the exterior of the choke tube allow the use of a muzzle device while still constricting choke to make those long shots on steel targets.