Front BUIS Question > AR Discussions

Posted: 12/30/2009 3:50:38 AM EDT

I've finally purchased another AR. It's an M&P 15 O.R. I need sight for it before I can even shoot it of course. My question is, do I need a front BUIS for gas blocks, such as the one made by Midwest Industries, or can I use just a regular sight such as a Magpul front sight?

I hope this makes sense.

Thank you.

Posted: 12/30/2009 4:34:03 AM EDT

[#1]

I think I read that there's a risk of a Magpul sight melting if mounted on a gas block.

Posted: 12/30/2009 4:37:17 AM EDT

[#2]

Really? Wow. Well, earlier this morning I had already ordered a MI front gas block sight. After that though I got to looking closer and it almost looks like the Smith's gas block and flat top receiver are in alignment. After looking at that I started to wonder if I really needed a "gas block" sight.

Maybe I'll just keep the MI sight on order then.

Posted: 12/30/2009 4:45:29 AM EDT

[#3]

It might be an issue only under extreme rapid fire situations. <shrug>

On a related note, I just checked magpul.com and can't even locate their sight. The MBUS category is empty. I wonder what's up with that?

Posted: 12/30/2009 4:49:58 AM EDT

[#4]

Hmm. Yeah I just did too. Weird. I guess I'll keep the MI front sight and try a Magpul rear sight. Hopefully that'll get me by until I can get an Eotech here in another month or two.

Posted: 12/30/2009 4:52:30 AM EDT

[#5]

From the looks of the pictures, although it is a gas block rail, it appears to be a tall version so you should only need a regular backup sight height.

Posted: 12/30/2009 4:54:57 AM EDT

[#6]

I'm sure it'll get you by... many folks get by forever without holographic sights.

Posted: 12/30/2009 4:55:15 AM EDT

[#7]

You can tell very easily if they are on the same plane by laying the rifle upside down a flat surface, such as your kitchen counter. Or even up against the wall.

Posted: 12/30/2009 4:58:13 AM EDT

[#8]

I have a Smith M&P15 OR rifle I purchased last year. The rail on top of the gas block is the same height as the rail on top of the upper receiver. You will need a rail mount front sight, not a gas block mount model, in order to achieve proper sight alignment with your rear BUIS.

Posted: 12/30/2009 5:21:47 AM EDT

[#9]

Thanks for the help guys. I ended up just getting a set of Magpul's for the front and rear. Honestly, I don't shoot AR's that much, and will be buying an Eotech within a few months. Hopefully these will get me by.

Thanks!

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