Includes H&K traded rail covers

The HPA BBs are the only biodegradable BBs whos biodegradation process has been approved by a U

You just simple remove a spacer to solve the issue

low profile tracer option

MAXX Model Airsoft CNC Aluminum Hop-Up Chamber AEG Series IM - PRO (Gold) Fusion Engine Includes H&K traded rail coversMaxx Model Features Machined from a solid aircraft aluminum block with tight tolerances to provide better accuracy, consistency, and durability Improved accuracy and ensure consistent air seal for ICS CXP CS4 EBB (include old models) M4 M16 AEG series Precision rotary dial design for fine hopup adjustments Re engineered the hopup levers and concave nubs to work best with R hop, Flat Hop and Standard Hop to keep the BBs shooting straight and accurate