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AR15.COM
10/12/2012 1:51:55 PM EDT
I just ordered a new dissipator 16" with rifle length handguards.

I want to put an Alpha on it AND keep the front sight post on the barrel.  Will the 13" fit or do I need another drop in option?
10/12/2012 3:10:47 PM EDT
[#1]
Well regardless you are going to have to remove the front sight block, so installing a low profile gas block would be easy at that point. Chopping the FSB would also be a great option. I really don't think the FSB is going to fit, take a look at other setups with low-pro gas blocks,




You can see the rail covers a lot of the gas block. I don't think it will clear a sight post.

There is always modification though
10/12/2012 6:51:15 PM EDT
[#2]
Damn, thanks for the pics, perhaps that's why I've had such difficulty finding pics elsewhere.  I'm just not into the magpul handguards.  My search continues.
10/12/2012 7:34:33 PM EDT
[#3]
You can do this.



You can try to look for a rail with a cutout for the front sight. I don't know if troy makes one in rifle length but they make one for carbine lengths.
10/14/2012 1:04:08 PM EDT
[#4]
APEX handguards make a very nice rail. it has site post cutout also http://www.apexhandguard.com/ take a look.