https://www.airsoftparts.ca/store2/index.php?main_page=product_info&cPath=69_95&products_id=3194
PDI RAVEN 6.01 Steel Tightbore - TM GBB Pistols 91mm - $35.00 : AirsoftParts.ca, Airsoft Parts...
AirsoftParts.ca PDI RAVEN 6.01 Steel Tightbore - TM GBB Pistols 91mm - Precision inner barrel for Marui GBB pistols QPQ surface treatment for superior...