How tough would this plastic be? Cause the extendo is pretty exposed. If its durable and you have good QC, your gonna get rich off this. But there are alot of people who have been burned by these projects (Tib extendos) and are going to be hard to convince.
AS for length, Id like to see 10 round mags (2 ball extendos) if plastic.
Try posting on
Alot more active Tib users there.