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Yep, follow this reco. I bought a refill station that leaked like a sieve off of amazon. Stik Boy is well worth it. 

In fact, the biggest issue filling a new tank is water management during the initial fill process. Once the dive shop fills it get a decent ebay filter addon plus a check valve and get a YH compressor and refill when you reach 3000psi. I only fill my tank to 4k to reduce YH pump stress as the...

Bump as I updated the thread. 

Ok, updated above, but still missing that square oring. 

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Add this cheap check valve before the gold or secondary filter to allow moisture bleeding without major air loss. https://www.amazon.com/dp/B07HKXV157?psc=1&ref=ppx_yo2_dt_b_product_details

In my view a cheap check valve for $10 really helps to keep stress off the system and help control moisture at a higher efficiency. Install at the input end of the gold filter. Normally when you bleed moisture off the YH you dump all the air between the tank and bleeder valve, then you have to...

Likely would need same type of parts but a reg that would handle 3k psi output from a bottle. Ninja carries a 4.3k psi carbon bottle reg that could do that but then better off with just a standard bottle fill station if you're just refilling vs this setup.

Hey all: Well in a mere 6 months I've gone from complete newbie to doing a modest bottle mod, so yeah somewhat pleased with my progress. Full admission, this is a design from others here and on GTA, so thanks to all contributors. My goal was a regulated pester at moderate 10-12 fpe with higher...

So my education begins on fittings. After reading the NPT specifications, as long as it's 316 stainless steel from a "reputable" supplier it should be rated for 5k psi, but the real issue is quality, especially in the threads. Poor ones don't seal. Is that the takeaway? I have a MVF fitting...

JamesD: Thanks, will start shopping...

Hey all: Where is your "go to" source for high pressure (e.g. 5000 psi) air fittings? I'm trying to source parts for a bottle conversion (e.g. hex nipple NPT 1/8" and such) and want to get the proper pressure rated parts. Is it a spec or ASTM rating I should look for? I ordered a 316 stainless...

I just received the missing orings yesterday from crosman and will update the thread when I have a chance to measure them.

Hey all: I've searched everywhere but can't seem to find a list of actual orings sizes for the Marauder Pistol, while the Mrod lists are all over the net. The ones I have identified are below with the associated missing "needs". If anyone knows the actual sizes of these, let me know and I'll...

The latest is that Umarex plans to have them back in stock but they don't have an ETA. Likely a Covid related supply issue. There are a few drop blocks around but most are out of stock (e.g. RAI). This one on ebay (CUSTOM TANK BLOCK for Crosman 2240, 2250, 2260, 2300KT, 2400KT & custom builds |...

Thanks, I will and report back...

No longer available meaning? Out of stock or no longer manufactured? If you know that is....

Chris: If you don't mind me asking what parts went into that mod? I'm interested in doing the same for my Prod as I'm modding for more shots and easier filling (hate taking my Tatsu off all the time), for the same type of duty pesting pidgeons where my wife rides her horse. I just looked up the...

1126.52

Perhaps, I stated that incorrectly? Was referring to hammer stroke for velocity. Spring is at 7 turns in and stroke at 1.25.