There are crevice's on each side of the BEU to maintain a constant flow of ventilation to the battery and components to prevent a buildup of heat

The M9 pistol is currently the 9mm pistol of choice used by the United States Military

AIP Enhanced 120% recoil /hammer spring set

and Yellow

Maple Leaf Hop-Up Chamber w/ 6.02 94mm Inner Barrel & Autobot Bucking for Hi-Capa 4.3 HPA There are crevice's on eachFeatures Unique "Crazy Jet" inner barrel creates an air cushion around the BB as it exits the barrel to reduce air resistance for improved performance High quality brass and aluminum construction Improved steel pressure plate High quality metal hop up adjustment dial Complete drop in barrel and hopup unit included : I Key Maple Leaf 94mm Inner Barrel 6. 02 Maple Leaf Pistol Hop Up Adjustment Wheel Maple Leaf Hop Up Chamber Autobot Hop Up Bucking