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clyderay44 01-30-2013 03:00 PM

Uneven rails? Help
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I have recently purchased a set of 45 degree offset buis, I had to purchase a rail to add to my stock hand guard as well. The rail I added is noticeably higher than the main rail on the receiver. What problems could this cause? I am unable to zero my buis, with windage adjusted all the way it is still shooting 6 inches left at 50 yards. Could this be the problem?

mountainman13 01-30-2013 03:07 PM

That certainly isn't going to help your situation. I'd look into a riser for the rear sight if I couldn't afford a new handguard. Personally, that handguard would drive me bonkers.

hoovco 01-30-2013 03:16 PM

You need to have those on the same sight plane. The rails need to be the same height.

clyderay44 01-30-2013 03:45 PM

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I had thought about a riser for the back sight but it would compromise my main optic. The way I see it, the only option other than a new hand guard would be raising the back sight. Is this correct?

hoovco 01-30-2013 04:16 PM

Yeah. I would just get a new handguard.

purehavoc 01-30-2013 04:27 PM

yes those handguards do move when hit hard enough even though it may seem tight right now ,you need a free float hand guard to do what your trying to do the right way

clyderay44 01-30-2013 04:51 PM

Ok, when I purchase a new hand guard should I go aluminum or polymer?

Quentin 01-30-2013 07:48 PM

Those are M4 handguards so they're pretty fat. Whatever you buy has to fit tight or the front sight will be flopping around. My MOE plastic handguards lock on the delta ring very tight but I wouldn't trust them for a front sight.


Actually that whole arrangement is a nightmare. Have you thought about just going with flip up sights and cowitness with the optic? You wouldn't need to replace the handguard then. I believe YHM and Bushmaster sell a folding front sight that works with that style gas block.

hoovco 01-30-2013 08:24 PM


Originally Posted by clyderay44 (Post 1116496)
Ok, when I purchase a new hand guard should I go aluminum or polymer?

I've never been a fan of putting any kind of aiming apparatus on plastic, or hand guard that's not attached to the barrel nut. If you want front sights, they should be attached to a gas block, or a rail that isn't going to move.

I personally would go with a FF hand guard that locks into/ onto the barrel nut for the most stable platform.

When you put your front BUIS on your stock hand guard, you lose some sight radius too. With a FF hand guard, you can stretch that radius out a bit. I love putting 15" rails on 18" barrels and 12" guards on 14.5" barrels just for that. Plus it looks pretty rad.

That's just me though, other people on here may have different thoughts.

purehavoc 01-30-2013 09:15 PM

Like this configuration , your going to have $100 + or - in the good quality FF hand guard but you should be able to run your pop up rear sight right thru your red dot and do away with the 45 deg sights . #1 they are a PITA and seem to get hung up on stuff , #2 It doesnt feel right to me when I put that angle out there with irons , red dot no biggy on the angle but I dont like the irons like that .

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