A&K Airsoft M249 & Mk46 Rear Sight Knob

Replacement rear sight knob for the A&K M249 & Mk46.More or less a dead copy of the original - had some trouble with the knurling but this is a pretty reasonable copy.If you lose all the parts, here's what you need:3mm Ball BearingM3x6mm Cup Point Grub Screw3mm OD 0.4mm Wire Diameter 5mm long springOnly thing you should need to do is run a tap through the grub screw hole. Use super glue to lock the threads, not threadlocker/Loctite, as methacrylate threadlockers attack most thermoplastics!I found 3mm long 0.4mm wire 10mm long springs on Amazon for cheap and just clipped them down to fit, putting the cut side inside the knob. Worked fine!See the pictures if you aren't sure how the knob goes together.