Hi All, have an Anschutz 380 that was rebuilt by Randy Bimrose about 10 years ago, using Maccari-supplied piston/breach seals. After re-build, gun did (and still) shoots only about 560fps with 7grain wadcutter, and about 485fps w/ 8.1 grain wadcutter. Seems on the low side, should be closer to an FWB 300 at 650fps. Blue Book of Airguns says "600-640fps", can't find the 380 in any of my Beeman or ARH catalogs from the 80's. It's also burping out tiny bits of oil into the breech with every shot - I thought this type of gun would/should have very little oil in the chamber, nearly zero in fact. So not sure if that means something is wrong, like a piston ring gone bad or other issue. Questions:1) Anyone know what velocity I should be looking for? Say, with 8.1 grain wadcutter2) I'm considering disassembly. Found the parts diagram and owners manuals on Anschutz archives, but this thing has nearly 150 parts and the exploded diagram is frankly not very helpful to the unfamiliar. Anyone know of any videos or written info to aid in tear-down?Love this gun, it's a joy to shoot. Would like to see if there are some simple things I can do internally to restore power and get rid of its oil burp.