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Discussion Starter #1
Finally got my ACR to the range last weekend. My main objective was just to get a few rounds through the rifle to see how it handles and to zero the iron sights.

Initially I set my target up at 25 yards, fired a group in the center and then the corners with my friend spotting. No impact, no idea for about 2 mags.

I moved my target up to 15 yards and realized that I was shooting about 2 feet low. I have to admit that I hadn't looked too closely at the MBUS sights until then. I didn't realize that they don't have elevation adjustments on the rear sights like normal AR iron sights. I don't know if it was just me and my friends, the fact that they are new, or thats how they always are but we could not change the elevation on the front sights with a bullet as shown in the manual. It just ended up tearing up the jacket of the bullet. I had to go back to my car and get a leatherman so I could use the pliers to crank them down. Once I got that taken care of I was able to keyhole groups in the x ring of my targets at 25 yards.

I was using Federal 55 gr XM193 with Pmags and USMC issued metal mags. The rifle ran flawlessly, no malfunctions, and it locked back on all the empty mags. One of my friends brought his Rock River AR and picked up some Remington hollowpoint 223 ammo for it. I think 40 gr. He could not feed that ammo from a mag at all, the first attempt jammed a bullet deep into the brass. We switched mags and my ACR ran it fine so we traded ammo so he could keep shooting. He only had 40 rounds compared to my 500.

The main takeaway for me on this trip was learning about the MBUS sights. I wasn't planning on getting optics for this rifle anytime soon since I'm fine with traditional iron sights but I think I changed my mind. I'm not saying I hate the MBUS sights but I have learned their limitations. They are folding backup sights that lack the ability to make quick elevation changes or have different size peep holes. They do what they are designed to do, no more, no less. I could get Troy sights but I might as well spend more, get optics and use the MBUS sights as they are intended, backups that probably won't get used much.

I plan on going again next month and took off the barrel when I cleaned the rifle to see if the sights maintain their zero. The range I go to only goes out 100 yards so I'll see what kind of groups I can get. On a side note one of my friends brought an Eotech we were going to throw on the rifle after I zeroed the iron sights. It hadn't been used much and had been sitting in a closet without batteries for a few years. We scratched at the contacts and threw in new batteries but couldn't get it to turn on. I'm not a big fan of electronic sights and this didn't help.

This post dragged on longer than I expected, I hope it didn't feel like a waste of time reading it.
 

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i take it you are of the devil dog type? if you were just putting the mbus sights on and couldnt hit paper doesnt suprise me. its no big deal. nothing is wrong with them the front sight post was prolly screwed in further than others. mine was way off too but i could still hit paper at the 25. i wouldnt worry about it. as far as the elevation goes. i dont like it much either i like my rear elevation option as well. good rifleman can make good shots without adjusting too. and you know when your are sighting it in at the 25 you on move your front sight post right? you wouldnt move the rear elevation knob(if it had one) but i like them. the mbus main purpose is a back up incase your optic breaks or runs outta battery power. you will get use to them. its hard to get use to new stuff when it comes to weapons
 

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I feel the same way about the MBUS sights I've been looking at adjustable folding sight with negative results. I think the Troy sight also do not have rear adjustments either. Funny, I've come to the same conclusion about looking at optics as well. I have looked at a band aid fix with some reasonable success ranging form $75 to $500 plus. Those choices are Leatherwood Optics, Vortex red dot series, AIMPoint and even Horus Scopes. My choice will depend on how patient I can be. Thanks for sharing
 

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regarding front post... I read in the manual not to touch the front post because it was set at the factory at zero LOL! I can't wait to get my at the range for the first time. I'm sure I'll be fine... I'll have lots of ammo with me :)
 

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Discussion Starter #5
I got out 6 months ago. I wasn't really concerned about the work it took to get rounds on target since they could have come from the factory weird and I still have plenty of room to adjust either way. I was more concerned about issues I have read about where people had to go to extreme left or right on their iron sights because of a leaning barrel, which thankfully I didn't have to do. As it was my first experience with any type of backup/folding sights, I was incorrectly assuming they would match any normal AR type iron sights so I could use them as my primary sights. I wasn't counting on that "backup" feel, although their name should have been a dead giveaway. I'm confident in my abilities to get rounds on target when I need to with the MBUS sights but to be realistic, most of my shooting will occur on a range under controlled conditions and I would prefer not to have to use Kentucky windage or a leatherman for every shot I take not at the zeroed distance. I'm not unhappy with the MBUS sights, I was trying to highlight my ignorance and the learning experience rather than blame the MBUS sights so that others that are taking theirs out for the first time might have more realistic expectations. Now that I think about it, I think I'm being redundant saying MBUS sights, since its like saying Magpul Back Up Sights sights. Now I just have to decide how much I want to spend on optics, almost too many choices.
 

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...man you guys are making me think about getting new irons...i think the MBUS are a neat concept...it's the front sight, like ya'll are saying, that worries me sometimes with its durability...metal screwed into polymer...especially an important screw that can't move much or you'll loose zero...but i haven't heard much except that most people end up going with something more familiar and solid as a replacement...i don't know if its the function of the MBUS or just the worry...

...i think it did help having a red-dot to double check my zero when i first played with the MBUS...but your right losman $$$$....
 

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I like the mbus sights and would recommend them to any competent shooter. I had to make a slight adjustment with the front sight and used a A2 adjustment tool and it worked just fine. As for scope I run a aimpoint compM3 and love it. NO issues and battery lasts for 50000 hours with it.
 

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Yep ... I agree with Type5... I don't think any harm was meant. I've been on this forum for a short period of time and I have seen anybody go out and blow up anybody either ... Have a Happy New Year guys, stay safe...and be careful out there!
 
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