so ammo bro's in cerritos, ca told me that...

the Magpul MBUS front Back-Up-Sight would melt if i placed it on a M4 Picatinny Railed gas block. i think that guy was full of shit, cause i think its used for military, police and private govt. contractors etc..., does anyone have any experience with this?

oh by the way i'm in CA so i'm not going full auto either.

 

yes it WILL melt. it is a PLASTIC sight mounted to the gas return block. they get very hot, if you havnt experienced them before. my friend melted his cause he wouldnt listen to me. get metal ones, you wont regret it

 

but hey thanks for your information, i will be getting metal ones. will any metal ones work? cause the guy at ammo bro's said that i'll have to be careful on certain metal ones too.

 

i know on some m4's, the gas block sits a little lower than the upper receiver rail, so sometimes the front sight post wont go high enough to be sighted in. if your gas block is lower, get a small picatinny riser, or mount the sight on the handgaurd, not the gas block

 

will do! but in that case then i could buy the magpul ones. right?

 

yes, the MBUS will work fine if you mount to the upper receiver picatinny and the hand gaurd, as long as they are both the same height.

also, if the gas block sits lover than the upper receiver, sometimes it will not fold down and lock because it hits on the handguard