G&G

G&G Cold Resistant Green Hop Up Rubber/Bucking

Prometheus

LayLax Prometheus Soft AEG Hop-up Bucking / Air Seal Chamber Packing, Purple

SHS

SHS Metal M4 Airsoft One Piece Hop Up Chamber Kit

Lonex

Lonex Airsoft Metal Enhanced One-Piece Hop-Up for M4/M16

Prometheus

LayLax Prometheus Hop-up Tensioner Nub Set for Soft & Hard Buckings, Flat

Prometheus

LayLax Prometheus Soft AEG Hop-up Bucking / Air Seal Chamber Packing, Blue

Prometheus

LayLax Prometheus Wide Use Rotary Style Hop-up Chamber (G&G Armament & KRYTAC M4 Series AEG)

ASG

ULTIMATE Upgrades AK Series Hop-Up Chamber, Metal

SHS

SHS Aluminum Self-Stabilizing One-Piece M4 Hop Up Unit

SHS

SHS Airsoft M4 AEG Hop Up Chamber Parts Bucking & Nub Included

SHS

SHS/PPS Reinforced Type96 L96 APS2 SD96 Hop-Up lever

JG

JG Metal Hop-Up Unit for M4 AEGs

Raptors Airsoft

Raptors Airsoft RTX Hop Up Bucking Gas Maple Leaf 50 Hard Rubber

Prometheus

LayLax Prometheus Hop-up Tensioner Nub for Soft & Hard Buckings, Bridge

Deep Fire

Deep Fire New Silver URX 16 Systema PTW Style Hop-Up System For Standard M4/M16 AEG Outer Barrel Front Kit With 6.02mm Steel Ti

Echo 1

Echo 1 M14 Hop-Up Chamber

Dboys

Dboys BIM-53 Plastic M4 Hop-Up

Element

Element Silicon Airsoft Hop Up Bucking 55 Hard