Vortex doesn't state if the Vortex Crossfire II 3-9x50mm Rifle Scope can be used with a PCP Air Rifle. I recommend contacting Vortex in regards to that information.
We would recommend a 1-piece picatinny rail from our friends at www.egwguns.com, along with a set of the 1" Pro-Series medium rings, PN# PR1-M!
The Vortex Crossfire II 3-9x50mm uses a 1" diameter tube. On most bolt guns, high rings would be needed to accommodate the objective lens. On AR15 platform rifles, extra-high rings are recommended. For assistance in selecting rings for your rifle, email us at Techsales@opticsplanet.com.
The Vortex Crossfire II 3-9x50mm 1in Tube Second Focal Plane Rifle Scope can be purchased with an illuminated reticle. The models that feature an illuminated reticle are MPN:CF2-31027 and MPN:CF2-31027-KIT1.
No, this Vortex Crossfire II 3-9x50mm Rifle Scope has a 1" diameter tube and would not be compatible with 30mm scope mounts.
The Vortex Crossfire II 3-9x50mm Rifle Scope with the Dead-Hold BDC Reticle features a customized hashmark design that helps eliminate guesswork on holdover and windage corrections. Good for hunting/shooting at varying ranges where estimating holdover is a concern. It is multi-caliber compatible.
To mount the Vortex Crossfire II 3-9x50mm Rifle Scope to a Browning BAR you will need a scope base first. The scope base at the first link below will work. I recommend using 1" medium height rings like the ones at the second link below.
https://www.opticsplanet.com/talley-picatinny-base-for-bar.html
https://www.opticsplanet.com/vortex-pro-series-30mm-riflescope-rings.html?_iv_tube-diameter=1-in
Yes, the Vortex Crossfire II 3-9x50 mm Riflescope will work on a 12 gauge slug gun.
1" high rings will be the proper choice for this optic.
Please email us at techsales@opticsplanet.coms so we can further answer your question.