Accuracy problem.
 

I've got an CA slr105 and I've got an accuracy problem. The gun shoots fine but every 5 or 6 shots on semi or auto one bb goes straight down. Any advice on what's going on ? Is it my hop-up ?

Likely, or a random airseal issue.

It's probably your hop-up maybe you should try replacing the rubber for air seal since that may be the issue.

Hmm, you might be right. I'll replace the rubber for the air seal, to see if that's the problem, if not I'll have to replace my whole hop up system.

Not likely, best chance it'd be is faulty rubber, ripped nub and or ripped seal where the nozzle fits. Likely the hop up unit is fine, can't say I know the quality of that brand though.

Yes, I hope it's only the air seal that's broken. Don't really want to replace to hop up unit. I can adjust it fine though, I don't know if that says anything.

Likely it's fine. If the nub is ripped, then the occasional (or more) BBs will simply roll out the barrel. If the breech end is ripped, then you'll have air seal problems and you'll lose velocity and range.

That's the strange thing, the gun performs well only after the 5th or 6th shot does one stray away from the usual grouping ( it still fires the same velocity, just not where it's suppose to fire ).

That does make it strange and hard to track down. What ammo/weight are you using, and what distance are you shooting at? Is it along the lines of your using 0.20g outside and find that at 75ft every few shots goes low? I guess I'll say give us better information so we can better help you. Our impression is your shots come out fine, but every 5th or 6th shot falls out of the barrel in front of you (within 10ft).

Ok, I use .25 gram bbs and my fps is around 380. My gun is roughly accurate enough to hit a big tree up to 150ft away. The 5-6th bb doesnt crawl out of the barrel it just shoots really crooked (far away from the grouping) and this doesn't only happen when I shoot long range, it does that at any range.