I've haven't found any solid information on why our Authorities have imposed that minimum barrel length for Semi-Auto's. The closest Ive come to is for safety reasons.
Safety. how?
No1Mk3 wrote:The literally picked a number based on the majority of 9mm having 118 or 119mm barrels, to exclude them or cost owners the price of a new barrel, if one was available. The lie they based it on was 120mm, or 5", was more difficult to conceal in a pocket and the proof it was b/s was the 100mm, or 4", restriction on revolvers.