Modify - Accurate Metal Hop Up Chamber for M16/M4 Series flags with roll top closure

with roll top closure

Covert Pack Viper Tactical Covert Pack

unfold diameter is 18cm

Made of aluminium alloy and stainless steel

Modify - Accurate Metal Hop Up Chamber for M16/M4 Series flags with roll top closureModify Accurate Metal Hop Up Chamber Designed for M16 M4 series AEGs. 2 types hop up arm Accurate adjustment; gear design for precision adjustment DESCRIPTION Modify's Metallic, Hi Efficiency Hop Up Chamber for M16 M4 GEAR MAKING ACCURATE ADJUSTMENT EASIER Hop up chamber and bucking mainly provide backspin to BBs as they exit barrel to increase flight duration and therefore range, whose proper adjustment can enhance trajectory. Modify's Metallic, Hi