I'm looking for a fiber front sight for my girlfriend's tapered barrel 22/45 4.5" I got her for Christmas. I found this one on midway but it says only for 6 7/8" barrel and was wondering why it wouldnt't work on her 4.5"? http://www.midwayusa.com/product/69...-rear-sight-with-6-interchangeable-lite-pipes I can get it off amazon for $26 and free shipping. The amazon description does not say it only fits the 6 7/8" barrel. I was wondering if anyone could let me know if it will work, or if you have a 6 7/8" tapered barrel mkii, if you could measure the distance from the inside of the barrel to the top of the front sight. I guess worst case scenario is that it is too tall and I grind down the nub that goes into the barrel slot before I install and drill the hole. Thanks!