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$314.16 (e.g. pi :D) 

$562.89

Yup! That F4 uses the same gas ram as my Vantage, so you could almost purchase it just for parts value!

Not yet. I haven't had time to disassemble the gun fully, to inspect and measure the existing piston seal. Removing the gas ram was comparatively simple. I'll have to pull up another YouTube video to guide me through the disassembly procedure, to make sure I don't make any rookie mistakes, like...

"It's a small thermal exhaust port, right below the main port." This one? 😂

That's so strange! Any theories on how that happened?

I'm an idiot. Their regular website has its pricing in kangaroo dollars, so it's the exact same price as on ebay. 🙄 So now I can add the moly paste and piston seal to my cart, on their regular website. Is this the correct seal for a Crosman? 

Yes, it is! The size of the socket doesn't have to be 14mm; anything between 10 and 15mm would work. But the bar clamp has to be able to open to at least 17" between the pads, to get around both the that flat part of the barrel assembly and the socket: But once the clamp is in place, one...

I sent a message to Custom Air Seals in Australia about compatibility, and they responded: The ebay listing has these specs/measurements: but I can't find any for the Crosman OEM part. The Crosman parts list just has a part number and a drawing with no dimensions.

Hmmm. Here's another aftermarket piston for ~$34, including free un-tracked shipping from Australia. It says it's a replacement for "BT9M22-00-5", but I don't know if that means it's also a replacement for BT9M22-00-5A <-- with the "A" at the end. Does anyone know if these are compatible...

Thanks! Looks like the bad part is BT9M22-00-5A. Searching Pyramid for that part returns their aftermarket ram, their part number PY-A-3830, for $50, which is less expensive than the Crosman OEM part. Should I also replace the piston seal while I'm at it? Anything else I should do? I googled...

I hadn't used my 6-yr-old Crosman Vantage Nitro Piston since October, and when I took it out yesterday, it was completely non-functional. The cocking force is about 1/4 of what it's supposed to be, the gun does a weird twangy thing when I pull the trigger, and the pellet doesn't move. Is this...