Check the listing for details. Proto Paintball 12 Inch Barrell Excellent Condition. Color: Black, Condition: Used. Listed at 30.00 USD. The Proto Paintball 12 Inch Barrell is a high-quality paintball marker accessory designed for improving accuracy and performance in outdoor sports activities. With a sleek black color and the trusted Proto Paintball brand, this barrell offers durability and reliability for enhancing your paintball experience. Upgrade your paintball marker with this excellent condition 12-inch barrell for improved accuracy and precision in your shots.