"In early 2011, the Army responded to these demands and sent some Vietnam-era recoilless rifles to Afghanistan. The troops were thrilled with the variety of ammunition available for these weapons, including a shell that scatters thousands of little metal darts called flechettes. In December 2011, Special Operations Command diverted some of its Carl Gustaf rifles and ammunition to the regular Army. American commandos have used the Swedish guns since the 1990s. Troops in Afghanistan got 58 rifles and 1,500 rounds of ammunition to try out. This included air-bursting high explosive rounds that are designed to hit enemies behind cover." medium.com
Having seen what the old 57 mm recoiless with flechette rounds did to infantry assaults I can only praise the wondrousness of this development. With the muzzle just above the terrrain mask or berm the 57 blew a hole 10 yards wide in an advancing infantry platoon. Flechettes are flexible steel darts. They will actually pin arms to ribs in a man who is hit.
When I was a kid lieutenant I ran a rifle company's weapons platoon for a while. This was in 2/2 Infantry Regiment. I had two jeep mounted 106mm recoiless guns in the platoon. these were anti-tank guns, but they, too, had a wealth of different types of ammunition that made them a source of great firepower against almost any kind of target. the 106 had a coaxially mounted 50 caliber spotter rifle. The 50 caliber fired tracer ammunition. The trigger was a disk on the side of the gun. If you pulled it toward you it fired the 50. If you pushed it in, it fired the 106. The whole thing was ridiculously easy. You looked through the scope on the big gun, put the cross hairs on the target, fired the 50 and watched where the tracer went. When you got a hit with the 50 you pushed the disk in and the 106 round went where the 50 bullet had struck This gun was very accurate at long ranges.
Important safety tip (Ghostbusters reference) Don't ever stand behind one. pl