Re-Break-in

[GoodOlRWS45]

I've recently had my mainspring replaced (about 500 shots ago) and I am still noticing a lot of barrel smoke after each shot.  My pellets are clean, no traces of oil, and I haven't lubed anything since I got  my rifle back from Umarex.  Is this normal?  Does it still take 1000+ shots to break in my rifle?  

Thanks

[yel01z06]

yes it will you prob . have some mystery oil in the compression chamber which is causing the smoke

[BumbleShot]

Was your mainspring replaced by a professional tuner, deburred, and honed? A pro tuner should have de-lubed the piston and chamber before reassembling, deburred and hatched the chamber, polished the piston and relubed with moly and high temp clear, tarred the spring, etc.

If so you can still see smoke here and there for 300 shots...  

You shouldn't hear rimfire reports if the rifle was tuned properly.  Smoke and ballistic variance is normal for a while.  300-500 pellets.  If she was properly tuned, she should be fun to fire despite the variables.  

300 shots are a litmus to test a newly relubed gun.  500-2000 before you know what the gun is really about.

IME, factory guns will never be the way they should be.  Beeman overlubes, the BAM guns are lubed with motor oil.  Both benefit from careful degrease and relubing with moly, high temp clear, and spring tar.

[GoodOlRWS45]

I don't know who at Umarex actually rebuilt my 45, and there is no loud report when i fire.  It has been difficult to sight my scope in, as it seems that my trajectories vary somewhat.  There is a huge difference in recoil and power though, and it is definitely louder.  But, I think that is to be expected since the rifle is 20 years old with countless thousands of pellets through her old mainspring.  I remember my Dad shooting Beeman Silver arrows through her a lot, and I know that couldn't have been good for it.  I will say however, even though it didn't have the power before the rebuild, I could put pellets into the same hole at 30 yds, and it wasn't hold sensitive.  Now, I'm lucky to get a quarter sized group at that distance, bench rested.  I was just concerned since the smoke means detonation and that scares me.  I don't want to do any damage to my new rebuilt rifle.

Thanks

[Plinkmaster]

I'm not to sure how good the repairman or woman ( I called and asked to talk to repair dept. about oiling my 48 mainspring and I talked to a Woman), I was surprised and asked, is this the repair dept. She said yes.My Buddy just got his Colt 1911 CO2 pistol back from repair. They said they checked whole gun out.But the cylinder doesn't rotate when You pull the hammer back,only rotates when you just pull trigger.the gun was sent in for another problem.

[cliffspot]

If the spring was changed by the factory you probably ahve a lot of grease in there. They are not as careful lubing internals like a good tuner. My tunes smoke for 20- 50 shots afterwards. Like the bruddah said....mystery oil!

[GoodOlRWS45]

Well, I guess I'll just wait for the smoke to clear up.  Not only did Umarex leave a bunch of "mystery Oil" in my chamber, but one of the screws that fasten my chamber to my stock is completely falling out...I can't get to the head of the screw without removing the chamber mechanism from my stock.  I'm not impressed with their workmanship.