Sorry for the error, we will contact OP for an adjustment on the product page. The .750" refers to the gas block journal the CAGB is compatible with.
Strike Industries does not provide the OAL of the Strike Industries Collar Adjustable Gas Block. It will fit on all 0.750" gas block journals. I would recommend reaching out to them directly for more information.
As long as your gas block journal diameter is 0.750" it will work.
Yes, it is low-profile.
If the inside diameter of your handguard is 1.4" or bigger, yes.
Max diameter is 1.375"
yes this would fit underneath that.