I should put a straight edge along the top of the receiver and barrel to see if they are in fact straight in line.
The IZH 61 is a "springer". Other than lubing the hinge pivots and detent with oil, the piston and spring are factory lubed. Dripping oil into the compression chamber is likely to result in uncontrolled dieseling. While it may "shoot faster", it will likely burn the seal and may damage the spring. This applies even to mineral oil. So, a little bit of grease is preferred.Now, having said that, I researched the 61 afterwards, and at a rated 490 FPS at the muzzle, it is such a low power springer that dieseling is a much lower concern. Even if you used mineral oil to lube the piston. https://www.pyramydair.com/product/izh-61-multi-shot-air-rifle?m=76What grease to use on a springer and where to apply is a huge and frequent topic on this forum. You will find a range of opinions very strongly expressed. Many people are deathly afraid of dieseling or "detonation", and can't sleep if they see any smoke come from the muzzle, or detect a burnt oil smell on discharge. Meanwhile, for generations before synthetic piston seals existed, oil soaked leather piston seals the only option. Many of those springers still work today, despite burning a little oil on every shot.That said, adding mineral oil to the compression chamber of a modern 12 to 20 foot.pound springer that uses a plastic piston seal, is asking to damage it.I like to read the manufacturer's manual, even if I decide that I am going to do something else. In the manual, "high flashpoint oil" is mentioned to lube the piston seal, rather than grease. That means, definitely no CLP, or anything containing a flammable solvent. It is not specific, except to use "springer piston lube" (implied). Strictly speaking that points to silicone oil, such as this:https://www.pyramydair.com/product/rws-air-chamber-lube-dropper-silicone-oil-50-oz?a=3002https://www.pyramydair.com/product/crosman-silicone-chamber-oil?a=311Machine oil is mentioned for the pivots and spring. Something like non-detergent engine oil. Not silicone oil. I like to use mineral oil with a touch of moly grease mixed into it. May would say, 3-in-1 or sowing machine oil, although 3-in-1 that has a "cleaner" in it, might include a flammable solvent.Here is the user manual for the 61: https://www.pyramydair.com/airgun-resources/manuals/izh-61-multi-shot-air-rifle-owners-manual.pdfQuoteMAINTENANCE Before doing any maintenance on your airgun, make sure it’s unloaded. Lubricate the air compression chamber with a high-flashpoint oil designed specifically for use inside an air compression chamber. Lubricate the piston seal through the air transfer port, located on the inside bottom of the barrel breech when the magazine has been removed from the IZH 61 or when the bolt has been pulled back on the IZH 60. Oil the airgun (3 to 5 drops) after every 2,000 shots. Also, lightly oil the cocking arm linkage and bolt pivot points with machine oil every six months. Do not use firearm cleaners or low-flashpoint oils in the air compression chamber or near the transfer port and breech seal to avoid damaging your airgun. To lubricate the mainspring, remove the stock. Turn over the action and apply 6 to 10 drops of a light oil onto the spring. Reattach the stock. Oil your gun every 2,000 to 3,000 shots or every six (6) months. Don’t use too much oil. Using too little is better than too much.
MAINTENANCE Before doing any maintenance on your airgun, make sure it’s unloaded. Lubricate the air compression chamber with a high-flashpoint oil designed specifically for use inside an air compression chamber. Lubricate the piston seal through the air transfer port, located on the inside bottom of the barrel breech when the magazine has been removed from the IZH 61 or when the bolt has been pulled back on the IZH 60. Oil the airgun (3 to 5 drops) after every 2,000 shots. Also, lightly oil the cocking arm linkage and bolt pivot points with machine oil every six months. Do not use firearm cleaners or low-flashpoint oils in the air compression chamber or near the transfer port and breech seal to avoid damaging your airgun. To lubricate the mainspring, remove the stock. Turn over the action and apply 6 to 10 drops of a light oil onto the spring. Reattach the stock. Oil your gun every 2,000 to 3,000 shots or every six (6) months. Don’t use too much oil. Using too little is better than too much.