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Software

Plastic brick CAD - use this to send in your designs or read ours

Brick sources

The siren call of METAL compatible parts

www.bricklink.com - a plastic brick market, new and used

KRE-O parts, direct from Hasbro

Pick a Brick at LEGO.com

Chinese brick brands

Brick Creations

4 minute YouTube video of a young man's outstanding brick toy AR

2.5 minute YouTube video of NOT what we are doing

Gun stuff

Good article on the legality of making your own AR lower

3-D printing

Perhaps the world's first 3-D printed small arms projectiles