You used to be able to buy storage bags for firearms. The ones to keep them from rusting. I cant find them on CTD or midwayUSA’s site now.
http://www.brownells.com/gunsmith-tools-supplies/shop-accessories-supplies/gun-storage-materials/gun-storage-bags/handgun-3-pak-sku083054003-1154-4109.aspx?mc_id=80000&srch=1&gdftrk=gdfV21820_a_7c187_a_7c3466_a_7c083054003_d_083054003_d_11550
PVC pipe w/threaded fittings on both ends, grease.
This is all ya need.