BT-4

The BT-4 was a family of .68-calibre paintball markers from BT Paintball, built around the mechanical semi-automatic BT-4 Combat. A court filing dated 6 September 2005 describes and identifies packaging for the Combat, placing the line on the market by that date. BT's 2006 manual documents the early series.[1][2]

Design

The BT-4 used an inline blowback action and accepted CO₂ or compressed air. The Combat had a removable barrel, a sliding feed elbow, accessory rails and a removable grip frame. The feed elbow could be moved to expose the breech for cleaning. BT also offered an electronic grip frame as an upgrade.[2][3][4]

Configurations

In June 2007, retailer Paintball-Online documented the Combat, SWAT, Banshee, Assault and Ironhorse as configurations of the same platform. The BT Delta added MP5-style furniture. The BT-4 ERC packaged the Combat with an electronic grip frame, Rip Clip loader and Apex barrel.[3][5]

References

1. Tippmann Pneumatics et al. v. BT Paintball Designs et al., amended complaint, 6 September 2005, paragraph 35
2. BT Paintball Designs, BT-4 owner's manual, 2006
3. Paintball-Online, More BT Markers and Accessories, 29 June 2007
4. Empire Battle Tested, BT-4 Series Markers owner's manual
5. Paintball-Online, BT Delta, ERC and Rip Clip Paintball Markers and Loaders, 6 December 2007