BAE developed a longer barrel version of M109A6 called M109A6+ International Howitzer in 2001.
One significant improvement is a L52 modified M284 155mm cannon (JBMOU compliant) built by Watervliet. The IH is also fitted with a semi-automatic rammer, AFCS and upgraded suspension. pic.twitter.com/LLLZIidkcP

— Ronkainen (@ronkainen7k15) October 25, 2022