In reply to Captain Ly Cong Kim (msg # 521):
How big the boat is, is something best asked and answered IC because only Captain Kim probably knows. Darryl probably has seen it. Maybe Elliot and Andy if they've visited the Viet towns of Little Sai Gon (formerly Ft. Lawton and Discovery Park) and the fishing port of Little Da Nang (formerly Lawtonwood at the mouth of the Lake Washington ship canal).
Basically, it's a steel-hulled 32-foot cabin cruiser with a large open rear deck typically used for commercial fishing, pilot boat and harbour master duties. There is a berth that sleeps 4 on bunks and a cabin with a tiny galley. It was designed for the North Sea so it's stable but slow.
The standard Project auto-grenade launcher is the 40x46mm XM174. This was a slightly older alternative to the Mk.19 and a completely different design. It was pretty much the barrel of an M72 mated with the receiver of a Browning M1919 MG. Feed device was a 12-round magazine. Designed for infantry use it used the same low-power 40mm grenade ammunition as the M72/M203/HK69 and can therefore be used on a medium tripod or even hand-carried and fired (single shots only!). It uses a blowback design so cycling is pretty reliable. Ammunition is not belted but pushed round by round into a spring-loaded 12-round drum magazine hanging on the left side of the receiver. (I saw one on display in a museum in Sai Gon when we were travelling SE Asia.)
https://www.smallarmsreview.co...entry.cfm?arcid=2903
The Mk.19 is a completely different design mainly issued to teams deployed to the east (that is, it was introduced in Desert Search). It is also blowback-operated but as it uses a larger 40x53mm round with a much greater range. The linked rounds give it a much greater ammunition capacity but overall it's much heavier and with greater recoil making it impractical for infantry use and best suited for vehicle mounting. As only the navy originally remained interested in the concept the weight, recoil and non-interoperable round with other hand-held 40mm systems was not a drawback.
Tony
This message was last edited by the GM at 21:15, Wed 20 Sept 2017.