Meanwhile, the caliber was changed to 4.75 mm with "Prototype 3". "Prototype 4" and "Prototype 5" equipped with the scope took part in the preliminary NATO field test in 1977 in Meppen. After the contract with the FODTP ended H&K, Dynamit Nobel and Hensoldt were forced to continue development on their own with their private funds. In 1978, Mauser competed with their own weapon chambered for caliber 4.7 mm in a conventional case design but ultimately lost to the H&K G11. The caseless round was not yet telescoped and appeared "conventional".