Retro Arms Hop Up Chamber for M4

Retro Arms M4 Hop Up Chamber, produced from EN AW 2007 and EN AW 7075 aluminum.
This hop up chamber features a rotary style adjustment wheel and a collet nut to stabilize the barrel.

Note: This hop up chamber is designed to be used with a shorter bucking. If you intend to use a standard length bucking, you will need to trim down the length of the bucking sleeve for it to work.