Detachable Pre-Filled reservoirs?

[Fruit-Dove]

I don't understand the previous thread I wrote asking the same thing as this just got deleted. Anyways, it may sound like a silly question, but could anyone tell me why modern PCPs lost their ability to change their reservoirs, like that of the vintage airguns(for example, girandoni)? Is there any special reason behind it that I’m missing? Or is it simply because carrying a scuba tank around with them, and refilling them when they’re empty became a custom to airgunners, so that it is no longer a necessity to carry extra detachable pre-filled reservoirs? Thanks!

[Privateer]

It wasn't deleted. It was moved to the PCP Gate.
https://www.gatewaytoairguns.org/GTA/index.php?topic=143557.0

[Fruit-Dove]

It wasn't deleted. It was moved to the PCP Gate.
https://www.gatewaytoairguns.org/GTA/index.php?topic=143557.0

Yeah, I just found out that I wrote it in two separate gates.. shame on me   but can't figure out how I can remove it..??

[rsterne]

A had a Hatsan, which has replaceable reservoirs, and found a POI change when I swapped them out.... If you had a PCP like the Girardoni, where the bottle was the butt, then that should not happen.... but if the bottle/reservoir can in any way influence/touch the barrel or its position relative to the receiver, accuracy can be an issue....

You also have the issue that the valve must be inside the reservoir/bottle to be able to safely remove it without depressurizing the gun and losing that air.... While this can work for an unregulated PCP, in a regulated PCP you usually have a plenum inside the gun to provide air for each shot.... and disconnecting the bottle from that, and venting for safe removal.... could be complicated.... or waste the air in the plenum...

Bob

[Mikeflys]

A had a Hatsan, which has replaceable reservoirs, and found a POI change when I swapped them out.... If you had a PCP like the Girardoni, where the bottle was the butt, then that should not happen.... but if the bottle/reservoir can in any way influence/touch the barrel or its position relative to the receiver, accuracy can be an issue....

You also have the issue that the valve must be inside the reservoir/bottle to be able to safely remove it without depressurizing the gun and losing that air.... While this can work for an unregulated PCP, in a regulated PCP you usually have a plenum inside the gun to provide air for each shot.... and disconnecting the bottle from that, and venting for safe removal.... could be complicated.... or waste the air in the plenum...

Bob

I own a Hatsan AT4410 QE and have a spare reservoir. I have never notice any POI change when swapping. When I purchased mine, I was having a hard time deciding between the Mrod and the AT44. The deciding factors where the swappable reservoir and the mags with no moving parts. It turned out to be a great choice, love my Hatsan!