My cousin bent two of his, an 1187SM and Benelli SBE. I know another guy that bent his 1187 bbl to zero for his best patterning shell/choke combo.
Both of them bent them between two trees that were very close together. My cousin likes to just flex it a bit, then shoot as he claims it can get out of hand quickly. I looked at the barrels after he did this and you couldnt tell they'd been bent, but the POIs proved what you couldnt see. Both were dead on with the bead after.
I personally would be a bit scared to do it on a high dollar rig, but I have seen it work. My 1187SM needed it badly as it would not zero with adjustable Williams FO sights. I was too leary of doing it, so I just put a FF2 on it and removed the open sights. Rem told me they would replace it, but I declined because it patterns very well and I was afraid I might get a dud bbl if I swapped. I've killed a pile of toms with that rig, so have no regrets in not replacing it.
You might should contact Stoeger and see if they will replace it.