Description ASG – Ultimate Upgrade M15/M16 Hop-up Chamber is a replacement Hop-Up Unit for Airsoft M4 / AR-15 / M16 Rifles, designed and constructed to high standards by Action Sports Games in Denmark as part of their Ultimate Upgrade Parts Range. The Hop-Up unit is constructed from Alloy to reduce flexing over traditional Polymer Hop-Up Units and features Polymer Wheel Cogs and Retaining Clips. This is a great upgrade for Stock Airsoft M4 / AR-15 / M16 Rifle and especially when used in combination with a new Hop-Up Bucking and Barrel Set. This is a perfect purchase for those Airsoft Skirmishers looking to bring their project guns back to life, or for those with little tech knowledge who are also looking to upgrade their weapons. Perfect Upgrade Alloy Hop-Up Unit Screws & Clips Included
