AR15.Com Archives
 Fixed front sight base or flip-up style on rail.
Meanj82  [Member]
10/6/2009 11:47:11 PM
So heres my dilemma....

I live in a state that still has post ban regulations in effect (In this case, no Bayo lug). I had to sell my last/first AR uppers during the little economic downturn that we had to help make ends meet and I'm now in the process of being able to buy/build a nice one. I can grind off the Bayo lug, but I can't park it. I don't mind running a longer rail with flip up sights but I don't have the tools to set one up so I would need to buy it and this would take care of not having to worry about milling down a bayo lug (I think the demilled ones look like ass personally, but thats just my opinion). I'm not at the point in my life where I can afford multiple ARs, just one really nice one that has to work for everything. Do you guys prefer fixed front site bases or rails like a DD or Larue with a flip up front site. I will be going mid-length with a fixed FSB or with a rifle length rail and sights. How is the rail/flip up sights for reliability and accuracy? This being probably my single biggest concern, I need my AR to function flawlessly and be as reliable as possible. I notice the military seems to be maintaining the use of fixed FSB but then again the military doesn't have to observe AWB legislation.
GhostRing  [Team Member]
10/6/2009 11:49:47 PM
If I were to have ONE AR, I would keep it a fixed FSB.

Dirt simple.
DBLTAPP  [Team Member]
10/6/2009 11:52:19 PM
Originally Posted By GhostRing:
If I were to have ONE AR, I would keep it a fixed FSB.

Dirt simple.


I agree.. fixed
BW1695  [Member]
10/7/2009 12:05:07 AM
If you get a good quality back up sight you will have no problems - If you are looking to go midlength to cover the gas block I would look at LaRue or the Specter length free floats from YHM. I just installed a free float diamond series specter length on my most recent AR and it turned out better than I could have hoped for... LaRue would be my primary recommendation but you are going to pay for it. You can also always go with the rail systems that allow for the standard front sight but allows the rail to also continue past it (such as troy industries). As it goes you will get what you pay for...so if you want to go with a flip up sight then go with a quality set - YHM or LaRue are my personal favorites. Great thing about leaving yourself open with the versatility of the flip up sights since you are only in the market for one AR that can do it all is simply this...if you want to put a scope on the rifle then get QD rings that will allow you to remove your scope and then utilize your sights - you can also of course also go with a red dot optic on a QD system and be able to flip between, scope or red dot and be able to get that front sight out of the way whenever you want.


http://yankeehillmachine.com/store/forearms.html

http://stores.homestead.com/Laruetactical/Categories.bok?category=AR+Handguards

http://store.troyind.com/12_MRF_CX_Extended_Model_Standard_Front_Sight_M4_p/srai-mrf-r2bt-00.htm

http://www.laruetactical.com/pics/Charts/StealthProfileSheet_Rev-3-16-09.jpg
Meanj82  [Member]
10/7/2009 12:32:52 AM
My plans are to be running an Aimpoint M4s. Most likely the upper will be a BCM midlength as well. I'm concerned that the flip up sights will be a hassle and less reliable and less accurate then a fixed front site base. If I didn't have to grind off a bayo lug I probably wouldn't even be considering going a full length rail with flip-ups. I checked out a few comp videos, it seems to be a half and half mix between flip-ups and fixed FSB's, come of these guys aren't too concerned about the beating their weapons take either and they seem to be ok. I'm still leary about it.
MrVegas  [Member]
10/7/2009 1:02:50 AM
Originally Posted By Meanj82:
My plans are to be running an Aimpoint M4s. Most likely the upper will be a BCM midlength as well. I'm concerned that the flip up sights will be a hassle and less reliable and less accurate then a fixed front site base. If I didn't have to grind off a bayo lug I probably wouldn't even be considering going a full length rail with flip-ups. I checked out a few comp videos, it seems to be a half and half mix between flip-ups and fixed FSB's, come of these guys aren't too concerned about the beating their weapons take either and they seem to be ok. I'm still leary about it.


How about this:



Link
_Caesar_  [Member]
10/7/2009 2:20:51 AM
Go with the fixed FSB. I have first-hand experience with borked sights due to bad rail installation. Even a slight misalignment of the forend rail can push your front sight enough to one side to cause your PoI to be significantly different from your PoA. In my case the difference is a whopping 18-ish inches at a mere 50yds, and this is with a brand new rifle. Now compound the problem by having your calls and e-mails go unanswered by your rifle's mfg and.... well, you get the picture. That's not to say that no one has ever had issues with improperly installed FSBs but, based on what I read in researching my particular issue, that problem is less common than a misaligned forend rail.

That being said, you shouldn't have any of the above issues if your choice of rail is monolithic.
BW1695  [Member]
10/7/2009 6:56:31 AM
Well the important thing is being confident in your weapon - sounds like you've already made up your mind and are going to go with the FSB - which will work great - slap that aimpoint on there and get to shooing. As far as grinding off the lug goes here are my recommendations, shop around and get a FSB without it ( I know I've seen em), or move to a better state! Post up some pics of that rifle when you get it done.