Dboy M203 M4 (BI-3181) Tutorial

We are responding to your guys' requests for better instructions on assembling the BI-3181!

In these videos we go over such things as:

• grenade launcher attachment
• battery installations - inside the grenade launcher and hand guard
• crane stock changes
• foregrip installations

Part 1:


Part 2:


As always, check out our Youtube channel for up-to-date videos:
http://www.youtube.com/user/hitguns