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Spiffy 11-02-2012 06:27 PM

Calling all Nightmare owners!
Hello all,

I have been for some time now, been toying with the idea of picking up a Nightmare lb or lb comp. Before I do, I would like to know as much as there is to know about Nightmares.
As I understand,

- They are called Nighmares for a reason. When they leak, they leak bad.
- If your Nightmare does not leak, don't take it apart.
- The seals are all but impossible to find. Unless you make a trip to the hardware store and get lucky.
- The leaking problem is usually attributed to shreadded o-rings, caused by burrs inside the lower tube.
- The shedded o-ring issue can be fixed by de-burring the lower tube with emery paper or using shimstock to slide in the valve ect.
- The lb is a stockclass Nightmare with a built in feed tube. The Nightmare lb comp has a cut away 12gr changer and direct feed.

I intend this to be a purely informational thread for me, and anyone it may concern. Please if you have anything to share, fire away!



MaD 11-02-2012 07:01 PM

Yes, they're nightmares for a reason. I would describe them as overly complicated and temperamental to work on.

You will not "get lucky" at the hardware store for seals. The O-rings aren't that complicated and are easily sourced but the 12g seal and internal valve seals are proprietary to the Crosman valve assembly used in the gun.

There are a number of reasons for the leaks. The main cause is simply rot. The guns are old and the seals dry up and turn to junk over time. The least complicated to fix are the external o-rings on the 12g and valve assemblies. You can indeed deburr the tubes to help clipping them. Using a size down from the factory size seems to help as well and in most cases they seal just fine.

The biggest issue is the internal valve seals. They are no longer manufactured so you either have to find an old kit (and hope they're not already dried out), make your own, or pay out the nose for some aging stock that a few sites bought up from Crosman before they made them EOL.

Bored383 11-02-2012 07:08 PM

one trick with the valve seal is the cup portion can be carefully flipped over in the brass fitting that holds it

and the o-ring that seals on the power tube can be scrounged from an automag rebuild kit, though I cannot recall which small one specifically

my suggestions on re-assembly . . . lots of lube

Spiffy 11-02-2012 07:12 PM

Thank you very much! I seem to have misused the word o-ring. As you said, I hear the internal valve seals a quite hard to come by.

Spiffy 11-02-2012 07:13 PM

Thanks for the tips!

MaD 11-02-2012 07:16 PM

I've tried the seal flipping trick a few times with no success. The problem always seems to be that they're hardened up so even with a new surface, the material is so far gone they won't seal well. Everything is worth a try on these guns though.

Spiffy 11-02-2012 07:16 PM

If any one has a shooting video of their Nightmare, I would love to see it! As I seem to have missed the good old days, I have never actually shot one. Apparentally, they fart quite badly.

Spiffy 11-02-2012 07:18 PM

I shoot a Phantom, how different in size are the cup seals?

B-17 11-08-2012 11:50 AM

My new favorite person just sent me 8 of the cup seals,

I will have to ask him if he would like his name out on the forums.


MorueM 11-08-2012 08:38 PM


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