The old orange 3M glue guns are obsolete, have been replaced by the next generation 3M hot melt applicators (glue guns)
3M 89396 | Hot Melt Applicator 1 x 3 5.5 To 7.5lb./hr. | 2JBN6 | Raptor Supplies United Kingdom
3M™ Jet Melt Low Melt Applicator
3M Polygun LT Glue Gun
3M™ Hot Melt Adhesive 3764 | 3M United Kingdom
10 X 3M Hot Melt Glue Gun Adhesive Sticks 3” X 1” Cylinder - industrial | eBay
3M – Archival Survival
Hot Glue Gun 15MM Hot Melt Glue Gun 200W 300W 3M Industrial Hot Glue Gun Professional High Power Use 15MM Glue Stick (Color : Set-2, Size : 1) : Amazon.co.uk: DIY & Tools