Bore Drop vs. Breech Drop Pump Guns
Breech drop is where the ball actually drops into the breech before the barrel. The original Nelspot, Carters, Phantoms, and others utilized this. The bolt is short.
Bore drop, like the Bushmaster pump and clones, is when the ball actually drops into the barrel. The bolt is longer, the front typically aluminum or delrin.
Breech drop pushes the ball up the lip where the barrel and breech meet. Proponents of boredrop claimed this increased pinching and chopping of balls. However, boredrop had the potential for a ball to drop into the barrel, bounce up, and get chopped by the bolt as well. Another page in the paintball hype saga.