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No, it does not come with one. however there are several after-market trigger and trigger frames that will fit it.
Yes, except south of Saigon, the former MR4 (IV Corps) was mostly swamps (the Mekong Delta).
Vietnam was divided by the US military into 4 Military Regions, also called Corps: MR1, MR2, MR3, MR4, or I Corps, II Corps, III Corps, IV Corps. 175's landed in country in '65. The only noted ones were SPs (Self Propelled Guns). The most dangerous AOs (Areas of Operation) in South Vietnam were the Highlands (II Corps) and I Corps; that's where the NVA were. South of those two AOs were mostly VC. The 175's appeared to be concentrated in I and II corps. Normally only one 175mm gun would be at a Firebase (also called LZ's-Landing Zones). Firebase Blackhawk at the top of the Mang Yang Pass in the Highlands had one such gun. The only good thing about 175's for non-artillerymen, was you could tell when they were going to fire it...it would lower it's tube for loading...when it raised, everyone could plug their ears; because they knew it was going to fire. The worst thing about firebases in South Vietnam was that they were very noisy. And you couldn't carry on a conversation with a 175mm banging away. Batteries of 155mm SPs were also bad, the vibrations from those guns, six to a battery (after Vietnam the army went to 8 guns per battery) would knock the paper plate full of YOUR FOOD out of your hands. And while holding your food, you couldn't plug your ears. 105mm field guns were also bad, but they were smallest batteries at a firebase, still noisy. 105's & 155's were stationed at Firebases by the battery (six guns), but the 175's seemed to be alone. See website: Weapons of the Vietnam War-15th Artillery