You can pretty much blueprint an Impact without ever spending a dime. Then once the gun is on point, shooting pellets and not constantly jacking with the gun, it can stay on point for a very long time. The last M3 I purchased, I did a one year test with it. My other two M3’s were sluggers right out the gate and were constantly under the knife until I got them dialed. My pellet M3 got a peek washer before I even shot it, proper lube, probe seating depth check, glued CF sleeve then proper reassembly. With all three of my M3’s, I found small issues with how they were set up. Not horrific issues that cause glaring problems, but they needed corrected.
I tuned that gun in one session for a certain hunting pellet and never touched it for around a year. The gun was stellar. Took it hunting all season many months after initial setup and cleaned house with it. After that test I lost my mind and the gun became a guinea pig for barrel testing. It’s now a pellet/slug shooter without having to touch anything other than my wheel. And still no hot rod parts.