Tricer PA Adapter One Size. Designed fore ease of use simply slide the Tricer-PA threads over your swivel stud insert the locking pin attach the rail and tighten the nut. This sturdy and efficient adapter ensures a seamless upgrade giving you the versatility to mount a wide range of accessories with confidence. Specifications for Tricer PA Adapter: Manufacturer: Tricer Attachment Type: Picatinny Package Contents: Tricer PA Adapter Tricer PA-SP-ADP-1: PA Adapter One Size