I was having a look back at the info I'd got for the equipment of the British Infantry Battalion, prior to making some updates and corrections. I realised I had 'swerved' any weights for the 3-inch mortar, so had a check back through sources and remembered why that was. I have had a good search through the Canadian online sources and compared against other info available. I thought if anyone might care about answering the question they were likely to travel through WW2Talk at some point, so thought I'd put the chronology up here and see if anyone wants to throw rotten fruit at it... Early war there are two documents of importance, both available online in various places I think. Handbook for the Ordnance, ML 3-inch Mortar, MkII (Aug 1937) SAT Vol I, Pam 9, Mortar 3-inch (1939) (Jan 1940) The former gives component weights as; Mortar barrel - 44lbs Mounting (bipod) - 44lbs 9oz Base plate - 37lbs The latter gives loads for Nos.1 to 3 inclusive as; No.2 (barrel & spares) - 44lbs No.3 (bipod) - 44lbs 8oz No.1 (base plate & sight) - 37lbs Straight off there's a little quibble there, as the Handbook gives no weight for the sight and the SAT Pam suggests it's counted with the load of the No.1, however he only seems to have the weight of the base plate included in his load. Scroll on to the venerable US Army publication TM 30-410 (Handbook on the British Army, etc... September 1942), which gives the following component weights. Mortar - 42lbs Mounting - 45lbs Base plate - 37lbs Total - 124lbs There was then a great deal of time and effort invested in increasing the range of the 3-inch mortar, from an admitted unimpressive maximum of 1600 yards, to closer to 3000 yards. In the event the max range acknowledged was around 2800 yards (2750 in some quarters), which finally allowed it to outrange the 8-cm Granatwerfer 34 which had a range of 2400 metres (circa 2625 yards). SAT Vol I, Pam9 (1944) (Mar 1944) gives updated loads for Nos.1 to 3, but not component weights; No.2 (barrel & spares) - 51lbs No.3 (bipod) - 44lbs 8oz No.1 (base plate & sight) - 52lbs Clicking robotically through the Canadiana Website offerings, the following individual component weights are offered; Mortar (Mk2) - 43lbs Mortar (Mk4) - 43lbs Mortar (Mk5) - no weight given, 'similar' to Mk4 Base plate (No.1 Mk1) - 37lbs Base plate (No.1 Mk1A) - 34lbs (airborne use) Base plate (No.1 Mk1B) - 41lbs (strengthened) Base plate (No.3 Mk1) - as per No.1 Mk1A Base plate (No.4 Mk1) - as per No.1 Mk1B Base plate (No.5 Mk1) - 43lbs Base plate (No.6 Mk1) - 34lbs (late war equipment, mentioned in particular for use in Far East) Mounting (Mk.1) - 45lbs Mounting (Mk.2) - no weight given, 'similar' to No.1 Mounting (Mk.2X - ?) - 44lbs 8oz Mounting (Mk.3) - 44lbs 9oz Mounting (Mk.4) - no weight given, for special roles, designed by Messrs Jowett Cars Ltd Mounting (Mk.5) - weight given as 34 to 36lbs AND corrected to 44lbs Sight unit mentioned as approx 5lbs, case 1lb. A revised three-man load from (I think) early 1946 gives weights of; No.2 (barrel, with recoil system, cover) - 40lbs 8oz (spares not included in figure) No.3 (bipod, less recoil system) - 36lbs No.1 (base plate plus sights) - 40lbs (as 34 + 6) Complicated 'innit? Gary