Slavia 631 Main spring? Please?

[bionic]

so I just get my new slavia 631.
I take it apart and moly it good.
it sounds ok now but shoots fairly weak compared with my other guns.
can anyone recomend a web site or store that i could buy a stronger spring from. ? I cant seem to find any.
are they all gone ? did i miss the boat?

[calculator]

You missed the boat....on the internet. Supposebly princess auto sells compression springs. But so far I have found none there, or at NAPA, or CT, or Wal-mart, or many other places.

[airgunfun]

The only source left is the springs found on Gunbroker. Jim Maccari did offer CZ 630/631 springs but no longer. The 'machine gun' springs at Princess Auto are long gone.

oops...I don't see them on Gunbroker anymore.

Try this guy...he imports springs directly from Bulgaria.

jordan_batchvarov@yahoo.com

[RossB]

Some very powerful springs will fit into the 630/631 but the limited swept volume results in more cocking and firing harshness than increased muzzle velocity.
Spring guide OD is .480", piston ID is .778", coilbound spring room is 4.8".
Some heavy, .128" wire springs will fit but could overload the trigger sear.
The Crosman Quest 1000 spring may fit but would be overpowered.
The 38 coil .110" wire mainspring for a Diana 27 is a good option.
Your local gun dealer can order it from London Arms - Part #300374.
The Princess Auto machine gun spring (Recoil Spring Part #14A for the Inglis built WWII MkI Bren gun?) was 63.5 coils of .105" wire with .714" OD which usually sets up at .720" OD.
Princess Auto sold them for 99 each cents plus tax.
With a spring compressor 44 coils of the .105" wire can be safely installed.
People have claimed 700fps with piston weights and 42 coils.
These springs are still available if one knows where to look.
I do not knowingly supply them to, or install them for, persons who do not have a PAL/POL.

[RM422]

I have my Slavia 631 shooting at about 630fps with a lube and tune and 3 washers in the piston and the original main spring.

[bionic]

Thanks for all the info. I'll try my local gun shop for the diana spring.
I got washers today. 4 fiber ones for the spring guide and 3 steel ones for the piston.
also got some silicon lube from crosman.
and 2 springs and a screw for my 2240.
thanks for all your responses.