i can tell you that your moe handguards are not designed to mount a sight. they are designed to work with a front sightbase gasblock like these
these fsb gasblocks cannot be mounted to a rifle barrel unless holes are cut in the barrel gor mounting. this operation requires special jigs a a drill press and special bits. its a job that is one of the two things on a ar15 that really isnt diy for most folks
most likely your gasblock is not an upper receiver height gasblock. this is almost a rule with picatinny gas blocks. you need an upper reciever hieght gas block like these
measure the diameter of the barrel at the gas port it should be .750 before ordering.
you will need a metal front sight as you cannot mount a polymer to a gasblock and keep it from melting.
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." — L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...
"I crapped my pants to avoid the draft!!" -Ted Nugent
Last edited by JonM; 03-16-2015 at 06:25 PM.