5.11 Training Barrels easily replace a factory barrel with a bright yellow, high impact plastic insert that guarantees everyone around you knows your handgun is safe. Designed to be used in realistic training exercises. Made of high impact plastic, our yellow Training Barrels cannot be missed in a training situation. Everyone in the scenario can rest assured that they are safe from the possibility of an accidental discharge when they see the firearm pointed at them during training. Easy to insert and remove, these training barrels are a must for any realistic training situation where there will be no live fire.