Tuning Stoeger XM1 S4 suppressor removal

Greetings! New to the forum and PCP world. 

I recently got a XM1 S4 and I am not sure how or what...perhaps when the gas was low it only dribbled out a .22 pellet and dropped into the suppressor but now something is kinda rattling around in there. I see how the inner design is so I suspect the rattle is more towards the inner chambers as I could not get it to roll down to the muzzle to see if it was a pellet. The manual does not show how to remove the thing. I can't really figure how either. I slid down the cover by the gauge but that's all. There seems to be 2 possible security (very small star with center pin type) screws towards the porting but even if I found a torx tip that can fit it....I am not sure how it even separates. Is it a clam shell type? does't it slide off like a shroud?

Anybody able to help? I appreciate it. 



Asides from that, in comparison to other entry to middle level spring and nitro piston rifles, this actually is not bad at all. Not a Hatsan but the grouping is surprising. Decently quiet as well and much much lighter trigger than my others. 
 
That was challenge 1. I have 2 sets of security drivers and the smallest one came kinda close but doesn't just "drop in" fit. But before I even try that, I would like to know if that even does anything to remove the suppressor. Challenge 2 was trying to figure out how the darn thing even came apart. I can't find a seam that looks like it splits top and bottom all the way through, not sure if it slide out and if you look at the various cut away pictures, it looks like it would not because there may be 2 points where it fits around flares of the metal barrel. So I almost suspect that the likely answer is that the 2 star screws come out and it opens like a clam shell despite not finding a clear seam. I did try emailing CS but sometime you get a faster and better answer in forums so ..... I am here. Apparently....not alone in wondering. HAHAHA 



Otherwise, I ditched the centerpoint scope for a Simmons scope I was using for my other rifle and dialed in for about 80 ft where my nemesis groundhog usually hangs out and I have to say, once dialed in, that was pretty spot on. I used Crosman hollow points and Beeman and they were both pretty tight groups. For the money, this is a good bang for the buck I'd say. I did also note that the fill nipple was a super tight tolerance on the quick disconnect on the Benjamin Pump I have. Luckily I had spare paintball tank parts around and those Quick connects were just large enough that the fill nipple fit.