All I can say is they are the marketting kings of airguns, unfortunately.

Your confusion is a result of their constant attempts at introducing new features.. Mostly just model names etc, but they abbreviate the mundane to make it sound better so they are constantly upselling the same thing.

Im not a Gamo fan so im afraid youll not get much good input from me so sorry in advance, some are and so be it , but with so much market share they have no excuse for not scrapping all the SAT, GRT, IGT, CAT, MAXXIM, 10X, CRAP, melting off all that plastic and starting from scratch building a decent quality well built rifle that doesnt kill scopes or new shooters hopes & dreams, with a good trigger at a good price.

As the service agent Youngs Airguns has a constant flow of gamo multishots as they break so often - with the smallest wear (they are plastic afterall) they fail so shots dont load properly or jam. The fact that they are onto version 3 after only a couple of years indicates they are in constant need for improvement to be reliable.. 

Cometa has a very good trigger for a budget rifle, with the only setback being the plastic trigger blade - theres no reason gamo cant develop something as good or better than the cometa

(But yes, $115 for a Delta Fox is a good buy - they are lower power so it should be a good shooter compared to their SUPERULTRAMEGAMAGNUM IGT 10X MAXXIPADS)

I have a BSA lightning (Gamo era), I put a Knibbs (Theoben Spec) gas ram in it and its just over 11 footpound and very smooth to cock and shoot - its a short cylinder so trying to get more power out of it would be silly. The BSA barrel should be very accurate, and a good reliable powerplant (now).

The trigger is actually ok; its heavy but not creepy so the let off is consistent. It techniclaly isnt a 2 stage trigger, but a pseudo-2 stage trigger - the sprung blade pivots slightly to give the feeling of a first stage before reaching the let off. Its odd, but works buts its still an example of Gamos masking tape fixes rather than spending the time to redevelop.

The CAT trigger is an improvement when incorporated on the mid power models but that was some years ago and they do not appear to have advanced, I must look at latest reviews. 

I recall Gamo bought out BSA and came out with Lightning and Spitfire models but did not manage to take the airgun world by storm, if members have a BSA version how is the trigger and what about a post.

When a Gamo was sub $500 was it acceptable to have some components of a lesser standard. Prices have moved with many Gamo rifles priced closer to $1000 over the last 12 months.

Less power and build on technology gains when next around the design table is my suggestion.

I have many favoured Gamo's and after much practice the accuracy is always limited by the trigger or perhaps that is true across many brands.

What cost does a good trigger add, when looking at other brands I will suggest $400 so hard to stay competitive.

Keep the posts coming

SAT = Smooth Action Trigger (should be S%it Action Trigger)

They are rubbish!

CAT = Custom Action Trigger

SAT = Smooth Action Trigger

G Magnum are a work out.

Mach 1 has the oversized piston 33mm instead of 25mm

Pictured is a .177 black fusion Mach 1    @ 20ft/lbs muzzle energy