My front site cracked and the upper part of the post disappeared today while blasting zombie targets. It was at about the 650th rd. through my 9mm early serial S2k with receiver upgrade. Have there been any significant changes to the carbine, particularly the front or rear sites? I know BFG use to offer a nice replacement, but I never got one thinking they were too expensive. Are there any other options? Does Kel-Tec still make the al. railed forends and can they be had under retail? Does anyone offer replacement parts or should I just get some more from KelTec and just change them out every 500 rds? Any other upgrades I should consider? I saw there was some sort of al. trigger conversion, but honestly if it's not a weak link the stock trigger doesn't bother me at all, though I did have to sent it in for warranty at 350 rds. due to broken trigger mechanism and receiver / internals upgrade. Thanks!