The Regimental Standard is at it again, with a great article on the Lasgun. This is obviously not to be confused with the flashlights Xenos forces use, as the Imperial Lasgun is the pinnacle of technology and worthy of everyone's respect.
Here is an excerpt. Go forth and learn the truth... all you have to do is follow the link
"While it has been observed that some renegade and xenos forces also make use of las-technology, their weapons should not be confused with an Imperial lasgun. Manufactured with neither skill nor artifice, their unsanctified weapons are little better than glorified flashlights unable to scratch even the most worn flak-plate."