The Swiss have long analysed the choice of successor to their cannonohaubic M109 KAWEST (currently there are about 130 pieces in service), which this procedure lasted respective years and had respective stages. The same plan tests that reached the final phase of the tender (Archer on the chassis of RMMV HX2 and RCH 155 embedded on KTO Boxer and extended Pirania V) [permanent 18 months](https://defence24.pl/power-arms/end-prob-artillery-for-Swiss). Not only the performance of these structures was checked for compliance with the requirements of the Swiss Army, but besides with what the manufacturers declared.