Maxx Model Precision Hopup Chamber SRG (R/H) For SRS/HTI GBB BarMaxx Model Precision Hopup Chamber SRG (R H) For SRS HTI for GBB Barrel Both SRG and SRE Right Handed & Left Handed Hopup Chambers are designed specifically for SRS HTI SilverBlack SRG version is designed to perform with GBB bucking types (MR Maple Leaf, VSR PDI,) SRE version is designed to perform with AEG bucking types (Maple Leaf, SilverBlack,) SRG and SRE accept both bridged and unbridged barrels One piece Precision Hop Arm design with adjustable