Hey guys I am in need of a little help. I am looking at replacing my standard fixed front sight/gas block with a fold down type. I'm looking at either a new gas block with a rail to mount a sight on or a one piece unit. the thing is I have not seen many available that have a bayonet lug. if you guys could point me in the right direction that would help. so here's what I'm looking for: a fold down front sight, and a bayonet lug. thanks for the help.