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  • GeoffF7 commented on Engineer777's instructable Printable Airsoft Submachine Gun6 months ago
    Printable Airsoft Submachine Gun

    Sorted. When armed there is some downward pressure on the piston and I was getting some rubbing of the aluminium tube on the two tongues in the rear receiver when it returned. Sanded back and fast return now :) Thanks again for the great design.

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  • GeoffF7 commented on Engineer777's instructable Printable Airsoft Submachine Gun6 months ago
    Printable Airsoft Submachine Gun

    Engineer777 this is an amazing design, thanks so much for sharing it. I have made the gun and after each section came off the printer and I assembled it I was continually amazed at how well it was designed. It is firing nicely however I do get one slight issue associated with the fin and the action of dragging the new BB up the rail to the barrel. It tends to "pop" out of the mag head with a bit of force and bounces around in the chamber a bit (with more force when the mag is full and the rubber band is tighter). Usually it locates itself OK but sometimes it drops to the left or right of the ramp and then gets jammed against the outer barrel/barrel housing assembly when the piston head comes forward to complete the loading process. Just wondering if you have encountered th...see more »Engineer777 this is an amazing design, thanks so much for sharing it. I have made the gun and after each section came off the printer and I assembled it I was continually amazed at how well it was designed. It is firing nicely however I do get one slight issue associated with the fin and the action of dragging the new BB up the rail to the barrel. It tends to "pop" out of the mag head with a bit of force and bounces around in the chamber a bit (with more force when the mag is full and the rubber band is tighter). Usually it locates itself OK but sometimes it drops to the left or right of the ramp and then gets jammed against the outer barrel/barrel housing assembly when the piston head comes forward to complete the loading process. Just wondering if you have encountered this issue and can suggest any type of workaround. I can see no obvious one tinkering with the model.

    Thanks for the reply! Yeah I set the rubber band to basically min allowable tension as a first move - so it barley has enough force to load the final BB. The mag is def OK - functions as you say, holds the BB for the fin return. It is where the channel opens up coming onto the lip of the front receiver and the ramp (see pic). From playing with it without the barrel in it seems like the force of the fin return "pool cues" it up the ramp, where it would then hit the end of the barrel and bounce off to the side - all before the piston head has located itself flush on the barrel end. My return action does slow towards the end actually when the spring is armed. It is fine when the spring is out, very fast and smooth. Just when there is pressure on the plunger held in place it...see more »Thanks for the reply! Yeah I set the rubber band to basically min allowable tension as a first move - so it barley has enough force to load the final BB. The mag is def OK - functions as you say, holds the BB for the fin return. It is where the channel opens up coming onto the lip of the front receiver and the ramp (see pic). From playing with it without the barrel in it seems like the force of the fin return "pool cues" it up the ramp, where it would then hit the end of the barrel and bounce off to the side - all before the piston head has located itself flush on the barrel end. My return action does slow towards the end actually when the spring is armed. It is fine when the spring is out, very fast and smooth. Just when there is pressure on the plunger held in place it seems to put off centre pressure on the piston that slows its return. Shall continue to play!

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