51mm was just the hangover from the 2" stuff we had for years. Remember your inserts? Good but as the guys have mentioned above re-tooling for more bombs is not sustainable. 60mm is widely available (and even used by our Spam cousins in theatre) so cadging a few bombs aint an issue.
You'll like it once you have a few shots of it.
because it can be used in the bipod role by qualified mortar men we can use the ballistic computer making it more accurate and becasue its just a smaller version of the 81mm it is man portable unlike the 81mm
we had the 60 and 51 on herrick we found the 60 was good but a bit too heavy to be used light role, we only had the longer barrel which was heavier than the shorter variant. we found it was more accurate than the 51. we would mainly use the 60 when in a fixed location and the 51 when out on patrol. it'll be a shame to get rid of the 52 as it is still very effctive.