There are a couple things to Keep in mind when picking a mod for your marker: 1. A5, X7, 98, and Tiberius Mods are not interchangeable with any other marker. They will only be good for the marker they were designed for. 2. The Ion mod fits any marker with the Impulse thread pattern, ie. AGD Tac One, Angel, Indian Creek Designs, Invert Mini etc.. 3. SP8 Mod fits any marker with a smooth feed neck of the same 7/8" diamiter, ie. VL, MR Spyders, Mini Mags, Auto Mags, Ariakons, T-68 etc.. 4. Spyder mod kits fit only Spyders having two screws holding the feed neck on and that go OVER the feed neck tabs and NOT THRU the tabs. 5. The direct feed adapter fits 7/8 in feed necks that are smooth only. Markers Mod'(s) Needed A5 A5 Mod Kit AGD-Threaded Ion Mod Kit AGD-ULE SP-8 Mod Kit Angel Ion Mod Kit Ariakon SP-8 Mod Kit + RIS upgrade BT Series Markers BT Series Mod Kit Custom 98 Custom/Pro Mod Kit Custom Pro Custom/Pro Mod Kit EOS NXT Mod Kit Epiphany Ion Mod Kit Shocker NXT Mod Kit Ion Ion Mod Kit Ion XE NXT Mod Kit SP1 SP1 Mod Kit SP-8 SP-8 Mod Kit MR-series SP-8 Mod Kit VS-series Ion Mod Kit T-68 SP-8 Mod Kit + RIS upgrade E-Mag SP-8 Mod Kit Electra Spyder Mod Kit Rodeo Spyder Mod Kit Matrix series Standard System Tiberius Tiberius Mod Kit Pilot Spyder Mod Kit Pheonix Spyder Mod Kit Imagine Spyder Mod Kit TLX Spyder Mod Kit Xtra Spyder Mod Kit Sonix Spyder Mod Kit Trilogy Standard System PCS US-5 SP1 Mod Kit Indian Creek Designs Ion Mod Kit X-7 X-7 Mod Kit Tippmann Project Salvo Salvo Mod Kit