Barska AR 30mm 2pc Cantilever Scope Rings w/ 1in Insert. Built with a forward offset cantilever design these Barska rings are built for rifle scopes with a longer length positioning the eyepiece comfortably above the charging handle where you can attain the appropriate cheek weld position for improved accuracy and comfort. The scope rings feature a standard 30mm tube diameter but it comes with a 1" insert allowing you to mount virtually any scope to your flattop AR rifle. The Barska AR-Series 30mm-1" Forward Offset Picatinny/Weaver Mount will attach to any Weaver-style or Picatinny rail with a sturdy thumb lock screw and the Rifle Scope is held in place by six heavy duty screws to prevent loss of zero and withstand recoil. Barska has built the mount out of durable T6 aluminum for added durability. Equip your AR rifle or carbine with a high powered extended length scope using the Barska AR Two Piece Cantilever 30mm to 1 Inch Mount Rings. Specifications for Barska AR Rifle Weaver / Picatinny Cantilever Mount: Rail Type: Picatinny or Weaver Rail Length: 1.75" Material: T6 aluminum Finish: Black Matte Weapon Type: Flat top AR-series rifles and carbines Tube Diameter: 30mm w/ 1" insert Gun Model: AR15 Features of Barska AR 30mm 2pc Cantilever Scope Rings w/ 1in Insert Rail Type: Picatinny or Weaver Rail Length: 1.75" Material: T6 aluminum Finish: Black Matte Weapon Type: Flat top AR-series rifles and carbines Tube Diameter: 30mm w/ 1" insert Gun Model: AR15 Forward offset mount by Barska Designed for flat top AR-series firearms Cantilevered design is ideal for scopes with longer lengths Aligns eyepiece with charging handle for ideal cheek weld T6 aluminum construction for added durability Mounts on any Weaver-style or Picatinny rail platform Secures rifle scope with 6 heavy-duty screws Black matte finish 30mm tube diameter with a 1" inserts accommodates almost all scopes Two (2) cantilever rings per pack Backed by the Barska 1-year limited warranty Package Contents: Barska AR 30mm 2pc Cantilever Scope Mount w/ 1in Insert AW11677 What firearm models does the manufacturer say Barska AR 30mm 2pc Cantilever Scope Rings w/ 1in Insert is compatible with? The manufacturer says that Barska AR 30mm 2pc Cantilever Scope Rings w/ 1in Insert is compatible with AR-15Barska AW11677: AR 30mm 2pc Cantilever Scope Rings w/ 1in Insert