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I was googling around for something today and came across this article on "tunnel guns" of which I had never heard of. Seems like an interesting concept and probably fairly useful for the intended purpose.
excerpt: (more info on the link):
"Quiet Special Purpose Revolver (QSPR; also known as 'tunnel revolver' or 'tunnel gun') evolved from 1967 US Army requirements for a silenced, multi-projectile hand weapon for use by 'tunnel exploration personnel' (so called 'tunnel rats'), which operated against Vietnamese communist forces in the numerous tunnels dug by NVA and VC personnel. The weapon concept was developed at US Army Land Warfare Laboratory at Aberdeen Proving Ground, in collaboration with AAI corporation, which was responsible for creation of the internally silenced ammunition, based on the "gas seal piston" concept (similar concept at the time was employed in a number of Soviet Spetsnaz weapons, firing PZ type internally silenced ammunition). The whole concept of the internally silenced ammunition is rather old and starts in the pre-WW1 era, but practical results were achieved only during 1950s and 1960s, when chemical and metallurgical technologies finally permitted manufacture of actual ammunition."
excerpt: (more info on the link):
"Quiet Special Purpose Revolver (QSPR; also known as 'tunnel revolver' or 'tunnel gun') evolved from 1967 US Army requirements for a silenced, multi-projectile hand weapon for use by 'tunnel exploration personnel' (so called 'tunnel rats'), which operated against Vietnamese communist forces in the numerous tunnels dug by NVA and VC personnel. The weapon concept was developed at US Army Land Warfare Laboratory at Aberdeen Proving Ground, in collaboration with AAI corporation, which was responsible for creation of the internally silenced ammunition, based on the "gas seal piston" concept (similar concept at the time was employed in a number of Soviet Spetsnaz weapons, firing PZ type internally silenced ammunition). The whole concept of the internally silenced ammunition is rather old and starts in the pre-WW1 era, but practical results were achieved only during 1950s and 1960s, when chemical and metallurgical technologies finally permitted manufacture of actual ammunition."
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