A Riker box containing an MB Associates "Project Meson" .22 rim fire cartridge adapter and a Javette with a tungsten point in very good condition overall. MB Associates (MBA) Gyrojets were a series of experimental 1960s firearms designed by Robert Mainhardt and Arthur Biehl that fired miniature, fin-stabilized rockets (known as "Microjets") instead of conventional bullets. These weapons, including pistols and carbines, were intended for high-power, quiet, low-recoil operation. Estimated shipping parcel size (LxWxH) 10 inches x 6 inches x 4 inches. Please note, shipping estimates are provided for LiveShipping calculations only and may vary based on weight and location. The auction house will combine multiple lots to reduce shipping cost. Please inform the auction house prior to paying your invoice for special shipping requests. Our primary method of shipping is via UPS Ground.