Just recieved my CZ550 in .458 Lott and am in the process of glassing the stock with a few added cross bolts embedded in epoxy. The factory CZ front sights are really junk. Too small and very cheaply made with a counter sunk white painted "bead"? The rifle is really nice, Lapped in the bolt(not the lugs) with a tad of 400 grit valve compound. Saw a post about replacing front sight with New England Custom and takes just a bit of fitting to drop in. It works great. Took a small bit off the bottom on a medium course stone and used black marker on the bright bottom, put the two sights together and scribed the base to match the CZ sight and used a round file to get close, shortened it up and final fit with a few more while testing fit. Works like a charm. Have the sourdough and will probably get the large dia bead and go with the one I can see the best. Also, ordered the NECG masterpeice large front sight hood. It fits with just a few file storkes to open the slot just a tad. Looks much better and gives as good or better protection for front sight. Hope to press the trigger later in the week and have some fun.