To answer JDRs question about leaks and loudness I'd weigh in that my Crosman Fire from 2016 has never had an issue and I'm sure I've gone through 3,000 pellets easily. It is gas ram. It was like $100. Wouldn't say it is loud but the Diamondback I have is definitely quieter. Has built in suppression.
My Avenger has had 2,500 through it and hasn't had a leak. Leaks in pcps are more from cheap O rings ripping or tearing from no silicone grease or age. As with anything, more parts means more to possibly go wrong. However the majority of o rings are under constant pressure and are squished in a way that seals up. It is actually when you leave a PCP Un pressurized that it may leak. And also the o rings typically breaking are those on a pellet probe that move not the ones that are in the block. But anyway, o rings are very cheap, a whole set to replace all of mine was like $20.
Because of how much air is being forced out at such high pressures (2,000 psi in my Avengers case) it is loud, like PB loud with out a moderator. But luckily we have an awesome guy at Buck Rail making LDCs that are stupid cheap but also amazingly effective.
check it out, he has some for most popular models and some that are generic for typical threads youll find.
My Avenger is so quiet with Bucks' non tapered LDC, but also makes basically twice the FPE of my Diamondback. I hear the metal target at 73 yards more than my shot.
A Marauder is supposed to be the quietest stock OEM gun out there and I'd agree they are really quiet. However they are overpriced and unregulated. I wouldn't recommend one in 2023.