The 2 and 3 extensions are suitable for use on AR15 weapons. Mounts with 2 extension are also suitable for AR10. The 95 mm long contact surface ensures a secure and play-free fit on every Picatinny rail. Available ERA-TAC Gen 2 34mm Adjustable Inclination Mounts with Nuts MPN Height Offset Inclination T5024-0020 1.46" 2" 0 MOA T5034-0020 1.46" 3" 0 MOA T5034-2020 1.38" 3" 0 MOA T5024-0032 1.26" 2" 0 MOA T5064-1020 1.46" 3" 10 MOA T5024-2020 1.38" 2" 20 MOA T5024-2032 1.85" 2" 20 MOA ERATAC Gen 2 One-Piece Cantilever Mount 34mm 0 MOA 49mm-1.93" High 50mm-2.000" offset T5024-0032