HA! That's the last time THAT comes loose!

[Hangtight]

Having got fed up with the slim rail system on my M4 constantly coming loose I decided to fix it once and for all. The problem is there's nothing to lock the barrel nut, so...

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Mark four of the spare holes in the barrel nut onto the outer barrel. Drill and countersink.

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A few pence spent on some cone end grub screws...

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Not coming off or moving unless I want it too. Much better!

 

[Sitting Duck]

Best weld it - just to be sure....

a good oxyacetylene torch should do the trick

(will be nothing left of the rest of the gun but that mofo will be fixed for sure)

nifty bit of work btw

did you tap all them holes yourself

or just use a load of grub screws to be sure ?

hate a loose wobbly gun - drives me nutz too

 

[Hangtight]

That's just the standard barrel nut that comes with the slim line rails,so it already has a load of threaded holes in the hope that some of them will line up with the holes in the rail once it's tight. Seemed a shame to waste all those left over ones, so four of them are now home to the grub screws that lock the barrel nut to the outer barrel, and the points on the grub screws locate in the countersinks on the outer barrel. So it's indexed nicely and there's no way it can move.