here's a poorly constructed restriction head that I made.
made it to fit on a MTE P7 with assault head, which has a 40mm diameter, but as long as the head is 40mm in diameter, it should fit. based the head cut off design off of old military style light restriction/protection plates. It's actually just a 75mm circle which I divided into 6 with a protractor and just added some material to the sides. all of the paper and aluminum foil taped together

cone diameter 1: 40mm
cone diameter 2: 75mm
height: 60mm
Machining allowance 1: 0mm
Machining allowance 2: 0mm

haven't tried it yet, but I hope it works.


make your own cone> http://www.red-bag.com/engintools/calccone.php