What causes the bolt to flip when firing rifle?

[jberenyi]

Has anyone ever gone into detail about the root cause for this and what can be done tosolve this issue?

[longislandhunter]

The bolt on mine used to flip up sometimes, not always, but it was annoying so i fixed it with a rubber band  :)

I just took a medium sized rubber band.... looped one end over the trigger guard and the other end over the bolt handle.  The tension on the rubber band keeps it in place, it doesn't get in the way of my trigger finger  and there's no problem cocking the bolt with the band attached.  Looks a little stupid on the rifle but the only one who sees it is me and the squirrels I'm shooting at.  I've also noticed that the pellet groups got a little bit tighter now that the bolt doesn't flip up anymore.  

I'm sure there are other more "professional" fixes, such as aftermarket bolt and such, but the rubber band solved my problem and I'm happy.....  :)

Jeff

[ray1377]

I've read about that, but think this phenomenon is limited to a few and not all.
I have a Disco in .177 and the bolt might jiggle a little when shot, but it does not jump up and come unbolted.
Think I read where some were putting HDD's on theirs and it seemed to cure the problem.
Also might try putting a slightly larger o-ring on the end of the bolt where it enters the barrel. Slightly larger I say.
Ray

[chuckster750800]

I have heard, but I'm not sure,that you can relpace the nitrel bolt prob O ring to a venton O ring which is suppose to be a harder durometer.

Chuck,

[Mark5043]

Try this....After removing the muzzle brake,and barrel band,loosen the set screw on top of the breech,now gently press the barrel into the breech with the bolt open while tightening the screw.I had bolt movement when I did my recent caliber conversion on mine,and this solved it,by getting a better seat between barrel,and o-ring.

[Mark5043]

Before I forget..I always degas before working on PCP's even if I really don't need to.It's a good habit to get into....SAFETY FIRST GUYS!

[Bhawanna]

if you remove the bolt you will notice a small indentation in the end where the striker pin (?) is making contact when fired.  i filed my down enough to clean up the indentation and it doesn't flip anymore.  you need to remove about .040" off of the end of the bolt.  also by doing this it makes it easier to load longer pellets like the preditors.

[21grains]

Look at Crosman TV ad ,The young Kid shooting the Disco. The bolt jumpes every time he shoots. Almost 90 Up nothing to it.No Danger if it is taped back alittle jest enough to drag on the Action You'l be fine. Jest My 2C in the Pot  Franky

[havasufred]

My new .177 Discovery was doing the same thing, I posted on another forum, and was given all kinds of advice, I decided to call crosman, they told me that the bolt should not be doing that and to return it to them, I have done so and I am waiting for the gun to be returned any time now. I will post again with the results and what they did.
Regards Fred

[jberenyi]

havasufred - 12/10/2009 6:08 PM My new .177 Discovery was doing the same thing, I posted on another forum, and was given all kinds of advice, I decided to call crosman, they told me that the bolt should not be doing that and to return it to them, I have done so and I am waiting for the gun to be returned any time now. I will post again with the results and what they did. Regards Fred

Did you get it back yet?

[havasufred]

I am hoping to get it back this week. I will post the results.
Regards Fred

[havasufred]

I got the discovery back from crosman today, the Invoice simply said replaced.(The whole rifle got replaced) I just shot 20 shots over the chrony in doors, the bolt did not move at all not even a shimmer. I am glad I did not modify this or that and void my warranty. Thank you crosman.
Regards Fred