I have a 1-4X24 mounted (Meuller Speed Shot) with Burris tact 3/4" rings on my STAG 2T with the FSB. Does not bother at all. For me, I get a good sight.
I love my STAG and would not pay extra for the Colt or the BCM. Mine has been flawless and very accurate. Yes, I dont put 5000rds an hour through it so yeah, I dont put it through hard work, but I am not LE or military. Mine is for fun, but I would not hesitate to take it to any training or competition.
Glock 23 / 33
Kimber Pro Carry SLE
S&W 1911ES, S&W 6906, S&W M&P 9