View Full Version : Railed Gas block riser for Magpul BUIS

03-01-2010, 12:14 AM
I just purchased my first upper and I finally have a complete rifle.
It is a STAG H3 with the railed gas block and flat top upper. I got Magpul backup irons for the gun. I mounted the sights and set out to zero the gun today and blew 70 rounds before realizing the sights are designed to be used on a level rail. :90:

So I need a riser for my gas block that will be even with my back rails.

ANy idea where I can get the spacer or other ideas?

03-01-2010, 12:23 AM
i have heard not to use that sight on a gas block since its made out of polymer

03-01-2010, 12:25 AM
Some people have claimed that your gas block can heat up enough to melt the MBUS. It was designed for a level rail for a reason. I'd try TROYs gas block rail mounted sight.


03-01-2010, 6:44 AM
YHM makes a riser that you can use.


Not sure if this will keep the sight from melting. If you don't shoot a bazillion rounds at a time you will probably be fine.

03-01-2010, 7:39 AM
i have the same railed gas block , i am using a Midwest Industries railed gas block front sight. i got mine from Riflegear.com

03-01-2010, 7:41 AM
plastic + gasblock = melt

03-01-2010, 8:55 AM


03-01-2010, 9:20 AM
Magpul instructions warn against putting their sights on the gas block.

03-01-2010, 9:46 AM
Magpul instructions warn against putting their sights on the gas block.

This thread + other friends = I'm a dumbass that should read directions better.

Thansk guys, at least it didn't melt. It was all slow fire. Something else for the parts bin until I put a rail system on.