GHK M4 GBB Rifle Maintenance Tips
OptimusPrime
23 May 2018
More maintenance tips from BadaBing Pictures for owners of the GHK M4 Gas Blowback Rifle. This one covering cleaning and lubrication which should not be a chore if you value this GBB rifle... "This is a quick and easy maintenance guide for the GHK M4 GBBR. Taking you through the steps of cleaning and lubrication."