New Slavia CZ 631 cannot penetrate cardboard?

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nav0239 · #1 Post by **nav0239** » Tue Oct 25, 2005 3:05 am

Completely newbie

.

Just bought a new CZ 631 and made a silent pellet trap as in http://www.babymd.net/aa_improved_silen ... t_trap.htm. Put on a sheet of target paper with a cardboard backup. The card board is only ~1/8". Made ~30 shots at 3-5m. About 30% of the shots bounced off the target paper/cardboard and the rest went through. Tried it on a piece of pine board too and it only made less than 0.5 milimeter of a dent.

Is this normal or do I need to do something first? I noticed there is some oil on the cocking linkage and the breech seal and thoght the gun has been lubed in factory. I only cleaned up the barrel before making the shots.

I am using "Eagle gold High Performance Match Type Lubricated Pellets" made by L. J. Cammell in England.

Oh well, just put in 5 drops pellgun oil in the chamber and hope that fixes it.

ETA · #2 Post by **ETA** » Tue Oct 25, 2005 3:21 am

The CZ631 come out of the factory pretty dry of oil. However, the piston seal have a very thin lip which should still seal fine. Another place to check is the breech seal. The donut seal around the hole where you place the pellet. Make sure it is not damaged and that it seals and seats nicely. You can rub a bit of Pelletgun oil on it if it is dry.

I have a suspicious feeling that it is the pellets you are using, I have never hear of the brand you are using. It could be that some of the pellets are under size. Check to see if the pellets seat fairly snug into the bore. Another thing to try is to get another brand of pellets, like the inexpensive Crosman pellet that is sold in Canadian Tire, Walmart or some sporting good stores.

nav0239 · #3 Post by **nav0239** » Tue Oct 25, 2005 3:43 am

Thanks!

The breech seal looks fine. When I first opened it there is some sort of oil over the breech seal. I didn't do anything there.

The pellets are wadcutter type and not undersized. Because I needed to apply a bit pressure to seat them. I think the weight is 8.2. Maybe the pellets are too big for this gun? Will try other pellets as you suggested tomorrow.

One other thing, if I shake the gun uncocked I can hear the main spring (I believe) dangling inside. Thought it would be compressed a bit even un-cocked, right?

ETA · #4 Post by **ETA** » Tue Oct 25, 2005 4:34 am

Could the dangling noise be from side to side movement of the spring? There are cocking linkages that are fairly loose that can rattle against the spring if the gun is shaken.
How is the cocking? Is it smooth? Nice and even pressure?
You should not need a lot of pressure to load pellets into the CZ631. The barrel entrance is reamed for easy pellet insertion.

#5 Post by **sniper** » Tue Oct 25, 2005 7:04 am

Definitely there is a problem with that gun. At 5m, the pellets that bounced off the 1/8" cardboard which means they were only going perhaps less than 100 fps. Check the barrel after one shot if it's produced alot of smoke in it, usually the next shot would be lower fps.
Pellgun oil inside the chamber I think it's a bad idea. When the chamber heats up from shooting it might turns to carbon but i'm not 100% because I never try it. I have a special oil from RWS Chamber oil but I never use it since I'm not too sure 100% if that would be a good idea.

airgunfun · #6 Post by **airgunfun** » Tue Oct 25, 2005 7:51 am

If the gun is brand new...don't mess with it...just exchange it if possible. Definately something wrong with it.

snowman996 · #7 Post by **snowman996** » Tue Oct 25, 2005 9:02 am

I hope mine will be better than that when I receive it!!

SharpTeeth · #8 Post by **SharpTeeth** » Tue Oct 25, 2005 8:26 pm

Without having one myself to examine I would definitely suggest returning it and getting a new one. The rattling could be a broken mainspring or worse. Do not open the gun up because where you bought it from could refuse to exchange it.

airgunfun · #9 Post by **airgunfun** » Tue Oct 25, 2005 9:46 pm

SharpTeeth wrote:Without having one myself to examine I would definitely suggest returning it and getting a new one. The rattling could be a broken mainspring or worse. Do not open the gun up because where you bought it from could refuse to exchange it.

Exactly!!!

nav0239 · #10 Post by **nav0239** » Wed Oct 26, 2005 3:36 am

Wow, thanks everybody!

As suggested by ETA, bought some Crosman Copperhead Hyper Velocity (pointed, premium grade) pellets today. There is no pressure needed to seat the pellets. Quite different from the Eagle ones which I had to press them in.

The Crosman will go through the cardboard and about 8mm into the duct seal (tail end). The depth is quite consistent. Tried it on a pine board too. The tail end is about 3 mm into the wood. What a difference.

For the Eagle pellets that went through the cardboard yesterday, they either bounced off the duct seal, sticked to the surface, or just went into the surface : inconsistent. Tried a few of the Eagles again today, they all went through the card board but behaved the same way on the duct seal or slightly better. So, it seems that the Eagle is to blaim. And the pellgun oil may be playing a part too?

Is the power consistent with other CZ631 owners' experience?

It has this huge twang! Bigger with the Crosman. I now understand what everyone was talking about.

ETA,
The dangling noise will come from either left/right or up/down movement. The cocking is easy and smooth, almost to easy. I do believe now that it is coming form the main spring. Anybody heard the same noise with a new CZ631?

sniper,
No smoke at all. I put in the pellgun oil based on the user manual. What would you use to lube the piston then?

All,
Bought the gun online in Canada together with the pellets. If the power of the gun is not up to par or you all think the dangling noise is definitely a problem I will return it for exchange. Otherwise, I may just stuck with 3 x 500 useless pellets, I guess.

What a forum. I should have discovered earlier!!

ETA · #11 Post by **ETA** » Wed Oct 26, 2005 4:13 am

Power sounds about right. It is after all suppose to be 500fps or so. It might gain a bit with use.

Cocking effort on the 631 is very low and relatively smooth.
I suspect the dangling noise is from the cocking linkages. They are fairly loose in there. When you get a chance, remove the stock. Lube and grease the linkages. Wipe a tiny bit of grease onto the spring while you are at it.
Looks like you need to toss those Eagle pellets into the garbage. Don't want to ruin any more guns with them.
Just keep shooting and enjoy. The 631 gets better the more you use it.
Down the road, you might look into get a tune to get rid of the twang and pickup some quality pellets.

#12 Post by **Voltar1** » Wed Oct 26, 2005 3:15 pm

Good to hear you got her figured out.
Keep your Eagle pellets for your 1377 and just add a pump or two.
On the rattleing noise there is a spring in the stock of my 630s to take the slack out of the cocking linkage as was suggested. Maybe take the stock off and see where the rattle comes from.
They are no power house and if you get the trigger figured out they shoot like crazy.
Walter...