The really old-fashioned military front sight (SA GI model) is the least capable of snagging...it's merely a rounded bump on the front of the slide. Useless for IPSC unless you have remarkable vision.
Most IPSC L-10 use a Patridge style front sight, gold bead or a fiber optic, all of which stand higher and present sharp edges. Many compromises between the 2 are available with names like Novak, Kings, BoMar, LPA, etc.
As to brands, any low end 1911 you get is likely going to require some tuning before you'd be happy with it in L-10 unless you just want to get your feet wet with a stock gun and not worry about being competitive. As noted above, there are many choices and the SA MilSpec, to me, has excellent 3 dot sights that are enough improvement over GI that I can actually use them. SA also has a lifetime warranty and, per other posts on this board, I think their warranty work, if needed, is quite good. I'd personally go that route over any of the CD, Rock Island, Armscor, etc. offerings. With judicious shopping, you can probably even get a model above the MilSpec for the beavertail they offer.
/Bryan
