Air Gun Home :: View topic

Slavia · Moderator

I was looking for stuff about my CZ Slavia 631 and came across a piece of information on the CZ parts/accessories site. They state that an airgun spring has a lifespan of 6,000 - 7,000 shots, and that it should be inspected every 500 shots. When the spring has taken a "set" such that it is one coil shorter than new it should be replaced.

I don't have a point to make here - I'm just raising it as a discussion topic. It's the first time (that I can recall) that a manufacturer has addressed spring longevity so directly and unequivocally. CZ has been making decent spring-piston guns for quite a while, so they have some experience to back up their assertion.

What do you all think?
http://www.shop-cz.com/faq/t-306/

AirGunEric · Site Admin

I don't imagine this is an "exact science" but more an estimate based on their experience with -whatever- spring.

Who is going to take apart their rifle and "inspect" the spring every 500 shots? -seems a bit ridiculous to say the least.

Perhaps they have had springs compress/set to being one coil shorter after 6-7000 shots than when the spring was new- but does this justify a complete spring replacement? Sure, power level might be down a slight bit- but enough to get worried about this sort of thing? My take would be if it's shooting to one's satisfaction/expectations- leave it alone.

oddtodd · Silver Status Member

I agree with eric. I'm not replacing my springs till they go BOINK.

Slavia · Moderator

My purpose for looking was simply to refresh my memory on parts sources "just in case." I have several times that recommended number of shots on my (original) spring, and it's still fine. I was just surprised to see it spelled out like that.

donwalk · Veteran Member

38super · New Member

My FWB124 needed a seal after +20yrs, Airsmith called telling me the main spring had broken 3 turns from the end. All I noticed was a dead seal and had been chrono'd at 825fps with 8.2gr RWS a few years before.

edit: +7K pellets

lauchlin · Supporting Member

I have more than a few Springer's with 30 year old spring still working great

Alstone · Moderator & Site Supporter

When I bought my TX200 in the first 3-4 months I shot around 20,000 pellets, the spring length had decreased by 3mm. Air Arms supply spring adjuster washers 3mm thick, so I fitted one and things were back to normal regarding power output.
Now 7 years on the setup is still the same but with a power drop of around 40fps, and the gun has shot well over 50.000 shots.
I did buy a new spring about three years ago that restored the power output but I was not happy with it for some reason or other, so I put the original back, but I think I will change it for the new one now.
One thing about AA springers is that the spring preload is hardly anything at all, compared to most other springers, which should make a lot of difference regarding spring life
Al

Slavia · Moderator

Does the TX200 have a threaded end plug, or does it have a transverse drift pin, like many other springers? My Slavia and Hakim have long, threaded plugs, and as you said, very little preload when the threads first engage. (The HW97 is also threaded, but I haven't had it apart yet.)

Maybe they do that because a spring compressor would be awkward on a rotating plug.

Alstone · Moderator & Site Supporter

To remove the spring all you need to do is remove the action from the stock, the end block that holds the trigger unit is held in by a threaded stud, this block also sets the spring pre-load. All you need to do is stand the gun on it’s muzzle put your hand on top of the trigger block and remove the screw with your fingers after loosening it, this block will rise out of the tube about 15mm, and is easily pushed back with your fingers when reassembling. As I said very little pre-load

Al