I've been asked how much the plastic costs to manufacture one of these milestag gun housings. After a rather inebriated afternoon at the company xmas do with nophead he told me that the ABS filament he uses costs 2p per gram. The weight of my gun parts is 522g = £10.44UKP for a single gun housing. This compares very favourably with airsoft guns which cost £140+ in the UK and still need to be engineered to contain the MILESTAG electronics.
My design is custom engineered to fit the stock milestag electronics so there is no cutting, gluing, drilling required.