Just Bought a CMMG Bargain Bin Rifle - What Rear Sight?


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ezypikns
February 24, 2010, 01:14 PM
I just purchased on of the CMMG Bargain BIn rifles. It's the 18" flat top. It appears to have a front sight attached.

I'd like to buy a rear sight to attach to the upper. What are my options? And what are the pros and cons of each?

Basically this rifle will be going to the range for casual shooting.

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W.E.G.
February 24, 2010, 01:26 PM
If you want the rear sight that is issued on M-4 carbines you might get the MATECH.

There are lots of other good choices out there.

Zerodefect
February 24, 2010, 02:19 PM
Troy:
pros-best BUIS, flips down for more clearance of your optic.
cons- $120

http://global-tactical.com/troyindustriessightsthepairdeal.aspx

greyling22
February 24, 2010, 02:39 PM
magpul makes the cheapest flip up rear sight I have seen, maybe 35 bucks, but I bought a riser and a truglo red dot for $50 bucks on midway with coupon code. it's held up great and was about the same price as a non-folding cheap rear sight.

keep in mind when you ask an AR question that most AR fans seem to disdain the concept of "good enough" in their quest for the best.

Bartholomew Roberts
February 24, 2010, 03:19 PM
Do you want:

1) Multiple sight apertures
2) Same plane apertures
3) Elevation adjustable rear sight
4) Folding sight
5) Spring loaded sight deployment

c5_nc
February 24, 2010, 03:35 PM
Matech site is very good and affordable.

ezypikns
February 24, 2010, 03:50 PM
Do you want:

1) Multiple sight apertures
2) Same plane apertures
3) Elevation adjustable rear sight
4) Folding sight
5) Spring loaded sight deployment

I really don't know WHAT I need, which is precisely why I asked here in the first place.

I suspect with the amount of (as I mentioned, casual) shooting I'll be doing, that a single aperture would be OK for me.

Many folks here are so well versed in AR knowledge that talking to people like me is like talking to a two year old.

I'm discovering that there's quite a learning curve where these rifles are concerned.

Thanks to everyone for your patience.

Bartholomew Roberts
February 24, 2010, 06:09 PM
I really don't know WHAT I need, which is precisely why I asked here in the first place.

OK, I'll go down the list then:

1. Multiple Apertures - originally the rear sight of the M16 was not elevation adjustable and the two different apertures also were set to two different zeros - one for short range and one for longer range.

The advantages of the multile apertures are that a larger diameter aperture is handy for more dynamic shooting at close ranges (you or target or both are moving). The larger aperture is also useful in low light, since the small aperture can cut down light enough to make it difficult to see the target or front sight post in dim lighting. The smaller aperture is helpful for more precise shooting.

2. Same Plane Apertures - the A1 and A2 apertures are not on the same plane. That is, they both change the zero when you flip the aperture. For example, point of impact can change 4-7" at 100yds when flipping between the small and large apertures on an A2 sighted carbine. If you find this more of a bug than a feature, then a same plane aperture eliminates this problem.

3. Elevation Adjustable Rear - .223 is a pretty flat shooting cartridge. This is basically only useful if you plan to shoot past 300m using iron sights.

4. Folding Sight - do you want the rear sight to be mounted on the rifle, even if another primary optic is already mounted? A folding rear sight can be mounted underneath a magnified optic or in conjunction with a magnifier/red dot or night-vision/red dot without interfering. On the flip side, if you don't need magnification and want a rugged back up sight system that is immediately available if the optic fails, then a fixed rear sight might be more desirable (You can also use some optics like big ghost ring sights in the event of an optic failure)

5. Spring Loaded - You push a button/flip a lever and the folding sight springs into place automatically instead of you having to push it into position. A neat feature; but one of debateable value. It also limits your options in folding sights quite a bit; but it deploys really fast :)

Like anything else, just figure out what features you want/need first and then you can start the process of figuring out which of the twenty-dozen AR sights offers the best combination of features you want, quality and a price you can afford.

tju1973
February 24, 2010, 08:02 PM
Depends on what you want-- I bought an el cheapo UTG A3 "Match sight"-- although it aint match, it works pretty well-- I mainly bought it to just shoot my rifle (a CMG 18" 1/7")-- but once I decide and pay for a good optic, I will probably go with a Troy or other quality BUIS...

cbrgator
February 24, 2010, 08:05 PM
The Midwest Industries flip up sight is very good as well. Comes standard on every Stag Model 2.

FMJMIKE
February 24, 2010, 10:27 PM
I have a CMMG 18" Bargain Bin AR too. I will be using a scope on mine but I plan on picking up a Carry Handle with integrated sights. They are very good and combat proven. Just turn two screws and its off and you can put a red dot or scope on top.
http://combatoptical.com/images/products/detail_424_CORFM00012f.jpg

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