JL Progression GBB Rifle Maintenance
OptimusPrime
02 Jul 2014
Joe Lau, owner of Hong Kong-based JL Progession (also known as JLP International) posted this video for those who have started using M4 Gas Blowback Rifles, how to maintain the rifle with Silicone Oil. Better bookmark it for those who want to learn how to do it. JL Progression products are originally designed by and for the Professional Shooter.