Regulated & Not Regulated FX 500?

While reading online and watching some vids I found some say no and other saying yes as to rather or not the Royale 500 is regulated. I found one article when reading up on an AA S510 that a regulator instal was pricey but doable for those that wanted to try it for themselves. A few commented that they had done the same or similar mod on their Royales. Precision Airguns notes in his ads his are regulated, AOA does not. Also seeing and hearing from some YouTubers, yes and no. Could you please tell me what the difference between the haves and have nots? I did find a thread here about how if your 500 doesn't have a regulator you can use hammer spring tension to dial in FPS and best pellet Another said look for a hole by the pressure gauge on the bottom of the gun. Would anyone have an image to offer of this hole? Finally, another member told me all the "new" Royales have a regulator. Would anyone know what model year saw the addition of the reg? Sorry if this is a silly question, but I haven’t purchased a new air gun for well over 10/15 years and my TX200 is my only PCP type experience. I would like to find a clean used repeater like the 500 (or other), but would rather not buy one without the regulator. Many thanks.
 
I think your confusing a few different products..?

The Royale 500 is a rifle made by FX airguns in sweden. These days they are all regulated but I think the started out without regs?

The AAS510 is made by Air Arms in the Uk. They are NOT regulated or i would own one :(. You can add a after market one but you need to know what your doing.

BOTH of these 2 rifles have diffrent speed settings. 

I wouldnt call the tx200 a pcp type experience its still a springer, but sure i guess it shoots smoothly but nothing really comperes to a pcp.

 
The definitive way to tell is to take the stock off to see if there is a hole in the bottom of the Royale breech or not. here's a pic...
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It's the tiny hole under the gauge. 

Older models came with an aluminum bottle, newer ones have a carbon fiber bottle. The aluminum bottle is squared off towards the muzzle, the carbon fiber one is rounded. Original models also did not have a power wheel. Since these changes are so subtle, You'll see used rifles come up for sale with replaced bottles and wearing stocks that have power wheel cutout but, no power wheel. 

Deja covered a lot of your other questions accurately. Also, feel free to call up one of the retailers and talk with them. Most of them are very knowledgable and happy to give you the information you need in order to make an informed decision. :)
Tom
 
Thanks Guys. Deja, yes I realize I mentioned two different guns and manufactures. It was happenstance that while trying to figure out what 500's may or may not have regulators that I found a post about adding a regulator to the never factory offered regulated Air Arms S510. In that post, several FX 500 owners posted/chimed in, they were sending their guns to AOA or to someone to have their non-regulated guns converted vs. DIY that some 510 owners were considering via aftermarket regulator Two different guns, one topic.
Yes the TX is a springer, but as you might recall a lot of the hoopla in late 80's early 90's was over the compression in the piston that allowed that air to flow to the pellet for greater efficiency. Ergo, the pcp "type" experience many vendors were hyping. 

Thank you for the image Tom and how the type bottle and power wheel might also be an indicator as to regulation. I have found several (including yours) 500's for sale. The spread in pricing is appreciable, upwards of $400. All appear to be clean, ding free offerings. Now, thanks to you guys I better understand that the price difference may reflect the lack of regulation in earlier 500 models and how to tell which is which.