The Graco Models Mark II Picatinny Mount Case Catcher mounts to a picatinny rail to position the bag to match the ejection port. These can be indentified by only one cross groove. The standard rail will have multiple crosscuts.
Low Profile Picatinny Rail for M-Lok rail systems
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Graco Brass Catcher Customer Service and Trying Out the New
Primed Tactical Magnetic Gun Holder (2 Pack)
Low Profile Picatinny Rail for M-Lok rail systems
Any other ideas to catch pistol brass? Hard to police for it after
Graco Models Mark II Picatinny Rail Mounted Case Catcher for
Brass Catcher w/Picatinny
Ideas for Brass catcher for indoor ranges?
Hi Point 40 and 45 CAL PISTOL PICATINNY RAIL
Graco Models Pistol Brass Catcher Review
Ideas for Brass catcher for indoor ranges?