The modded SLR our SAS used in Vietnam it's a pretty good vid on a very rare weapons system goes in depth on the issues surrounding the shortening of the weapon.
I enjoyed it bit of cameo acting but still the contents there.
Special tribute to those brave operators that went in deep in very small teams.
In fact they have just recently recovered the partial remains of an AustralianSAS operator who fell from a choppers rope retrieval system back in 1969.