ICS GLM (6 shot grenade launcher)

bullets

Anyone know anything about these? they look pretty straightforward but having a wee bit of an issue with one.

This Landed on my doorstep a while ago, by coincidence the same
day I got paid my summer bonus which covered the cost of it.

(Only dry firing at the moment since I've no grenades for it)
When you wind it up the spring pressure is ok (I know it can be adjusted),
The first shot fires fine but when I squeeze and release the trigger for the next shot! the cylinder just flies around back to the un-wound position.
It rotates the cylinder to the next position when you release the the trigger.
If I try to fire real real slowly as it keep the trigger held for a while and slowly release sometimes I can get two rotations before it flies past all the others.

~B

NakedDex

As you pull the trigger, you're pushing the firing pin into the chamber, but you're also pushing a pin into the rotator which releases the lock plate (the part that stops the drum from free-wheeling under the spring pressure). When the pin engages the plate, the sear holding the drum disengages, so the pin is all that holds the drum at this stage. When you release the trigger, the pin disengages and the drum should make a 60 degree rotation and stop as the lock plate reengages under it's own spring pressure.
This may be simply sticking, allowing the drum free movement sometimes, and normal operation the next.
It would be worth stripping back the mech enough to lubricate the area, which may clear the problem. If not, you may need to open it up and check the tolerance, as it could be sticking from the plate meshing too tightly (a rub of a fine file might be enough), or reduce the clockspring/torsion spring pressure.


Bear in mind, I'm not familiar with the ICS MGL, but I do have the original CAW version that, I believe, it heavily borrowed from. Even from a purely mechanical standpoint, though, it's the most plausible reasoning.

bullets

cheers will give it a look, I may wait until I have grenades to put in it
just in case the extra weight in the drum/chamber is enough to effect things
as it rotates.

~B

NakedDex

It shouldn't be. The latching force is a thrust load, where the grenades will be axial. It should have no bearing on operation. My own one rotates perfectly empty or full. If anything, it's snappier when empty simply because the clockspring/torsion spring is under less resistive load.

bullets

Stretched a spring that applies pressure to the latch that locks the cylinder and gave it a little spray. It appears to have done the trick (for now)

(after I found it when it flew across the room :-) )
Thanks Dex.

NakedDex

Nothing worse than a disassembly in which you suddenly here a small clinking noise as a spring lands in another room.


Well, there's one thing worse. The guy beside me in recruit camp many years ago disassembling a Steyr for the first time and finding himself chasing quite a few vital components across the room under the glare of the CS and platoon sergeant, and several corporals. After that, everything else seems kind of ok...