Have you tried removing the pellet, and shooting a different one?

Possibly got an out of spec pellet?

Here is the owners manual
Select .pdf in description

From that, try this maintenance... even if it's new.
AND, from eveything I have read, don't use gun oils with solvents. No good for o-rings and such. I use Crosman Pellgun Oil
Your gun lists a silicon chamber oil made from the fat of carribian island virgins... RMCOIL here
Attached File


Are you using lead pellets, or non-led... Just curious.

Stupid question... is there a squib in the barrel?

Was going to be my next question, if barrel was blocked.

Could have gotten a "returned" rifle.


ETA: Is that rust in the pic? Looks like some sort of debris?

If there was a squib in barrel, the pellet would still move forward a bit and not just sit there.

I think you have a tear in the air piston seal and air is escaping within the power piston chamber and not going out the air hole to the pellet.

All springers have been known every once in awhile to have a burr within the air chamber at the area where the air tube is welded, that when one cocks the barrel will slice that piston seal to make the airgun useless. It happens. Only problem is, one needs to purchase a rebuild kit to overhaul and then find that burr, regrease/oil the system.

Trust me, those compression springs use lots of poundage to work, so safety is needed to not hurt oneself when compressing to remove the "cross-pin" from the rear of the receiver to remove the pin, then re-install pin after fixing.

You need to do a tear down, since you can't return to store. In this instance you NEED a piston spring compressor to help with disassembly/assembly to hold that spring in a safe manner.

 Airgun spring compressors cost around $100 +/- a few bucks to get a nicely made model, but there is some Utube vids online where you can build one that will still work well.

If your airgun uses an air-ram system, I'm unsure how those work as it's a self contained system and I haven't worked on those.

Dumb question, but have you broke-over the barrel and physically looked down the bore?

Also, try cocking (unloaded) and leaving the rifle set for say 30 minutes. Fire and see if you notice any difference in how it sounds, as in if it's leaked a partial air charge.

I did a little searching, and had read one of the "cons" of this rifle was . This leaves me wondering about a possible breech seal leak?

As mentioned above, a spring compressor can be easily built, I made one from scraps.

Sorry, I said it was a dumb question

Almost sounds as if the bore wasn't machined to specs?

I had a buddy who had a .22 semi-auto rifle that he said wouldn't cycle. I brought it home, and after looking, I'd found (because all he used was the cheapest ammo he could find, and looked like he never cleaned it) that there was a casing in the breech that the rim had separated from.

.177 is a small opening, but you might double check someone hasn't put something into the breech. Small chance, I know, but clutching at straws at this point.

A .22 wouldn't fit into a .177 breech.

If returning/exchanging is still an option, I'd go that route. You might contact Crossman, as if there's a spec issue, they'd probably like to be made aware of it.

Cock the rifle with a pellet in the chamber .   Take a piece of tissue and place it on top of the loading area .   While pointed in a safe direction fire the pellet .

Watch the tissue .  If it moves at all the rifle has a bad seal .


Maybe this will help .


gd

Re-read thread, saw no mention........

I know you've tried a different pellet, assuming from the same tin.

Do you by chance have a different tin/type/batch of pellets to try?

Might be worth a last resort shot.

What brand are the pellets? I saw mention of them in your previous post, but nothing on brand.

If it has been fired without a pellet in the chamber, even once, the spring could be broke. Thus, it would not develop enough power to launch a pellet. I would suggest that it be returned to Crosman.  They have treated me very well when I had a problem rifle in the past, just called them and they were quite helpful.

I was hoping they were possibly some generic brand that was out of spec. Being Gamo's, I doubt there's any issue.

Exchange the rifle.