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Even if you can fit that on your barrel, it will not level with the rear sight.
Use any BUIS, they level no matter what, with the condition they are
assembled on a straight picatinny rail.
Magpul makes some very nice and popular ones. Google MBUS.
thx for the info! i already know about mbus , i was asking because i like the look of the triangle gas block/sight. so i guess i'll have to go with the triangle ones tha go on the rail instead!
I just got the MAGPUL's and i love them - they work with my holo as well. You can find them on ebay from $50 - $100 on ebay which is where i got mine. In stores the set can be almost $200!! I love how they fold, but they are more a backup if ur red-dot dies. Someone posted pix in 'tacticool pix' of their sr22 done up with Magpuls - looks awsome!