AR15 M4 Carbine Build- front sight question
I have recently purchased several RRA complete lowers as well as stripped lower receivers to build into AR15's. My first one is going to be an M4-type carbine in 223; all of my receivers are the "flat-top design and have the removeable carry handle and NM peep sights. My question involves the upper and specifically the front sight. Most of the M4-style uppers have the fixed AR15 front sight which would match fine with the removeable carry handle with sights. Could I remove the handle/iron sights and mount a scope or would the fixed front sight be a significant problem since it's in the line of sight? The "optics ready" carbine uppers have a dovetail block for the front sight and use a flip-up front sight or a removeable AR15-style sight (I like it for appearance); would this be a better option? I guess that I'm wanting to have my cake and to eat it too; but that's why I bought all of the AR15 lowers and stripped receivers; can't ever have too many guns. Thanks!
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quote:Originally posted by aap2
I have recently purchased several RRA complete lowers as well as stripped lower receivers to build into AR15's. My first one is going to be an M4-type carbine in 223; all of my receivers are the "flat-top design and have the removeable carry handle and NM peep sights. My question involves the upper and specifically the front sight. Most of the M4-style uppers have the fixed AR15 front sight which would match fine with the removeable carry handle with sights. Could I remove the handle/iron sights and mount a scope or would the fixed front sight be a significant problem since it's in the line of sight? The "optics ready" carbine uppers have a dovetail block for the front sight and use a flip-up front sight or a removeable AR15-style sight (I like it for appearance); would this be a better option? I guess that I'm wanting to have my cake and to eat it too; but that's why I bought all of the AR15 lowers and stripped receivers; can't ever have too many guns. Thanks!
I can't directly answer your question (ref "cowitness"). However, an opinion, if I may:
Reads like you are going to wind up with several "AR"'s after all is said and done.
Use the tall front sight arrangement for those uppers you choose to use with iron-sights and the carry handle. Save the flat-top uppers for use with a gas block only (no front sight)..and mount the scope on those. Best, Joe0 -
You have several options, depending on what you want it to look like. You can go with Givette's option, lets call that option #1.
Option #1- gas block, no FSB, short scope rings/mount, no BUIS
Option #2- Fold down FSB on gas block, medium height scope rings, low profile BUIS
Option #3- Regular FSB with gas block, Tall scope mount/rings, fold down BUIS
Option #4- Aimpoint, reddot, Trijicon, ect, regular FSB with gas block, rear fold down BUIS0 -
I have several flat top rifles with front sight towers. You cant see them at all with a high magnification scope. say 4x or higher
If you mount an eo tech the sight tower is in the lower half of the field of view with a proper check weild, and to me its not much of a problem.
with an Aimpoint you need a mount that will put the tower in the lower 1/4 of the field of view because the sight picture is smaller and the front sight tower takes up alot of field of view and is in the way.
Alot of companies make folding front sight/gas block combos .A.R.M.S.,Midwest Industries, & GG&G make high quality combos.
EDIT
fSB is the front sight base, which is usually but not always the gas block as well.
BUIS = back up iron sights, which consists of a folding rear sight if you have a front sight tower or folding front sight/gas block, Or some type of detachable front sight if you have a picatinny gas block.
The folding rear sights are handy because alot of them allow you to mount a magnifier or tradition scope over thm when folded, If you buy the right height mount or rings.
Usually when building a flat top carbine, the whole point is to use the flexability that the picatinny rail of the upper offers.
This is usually best utilized when you co witness a red dot, and an detachable Iron sight, on the same sight plane as the red dot.. This way you have two seperate independent sighting systems all the time.. And Irons never need batteries.[;)]
I almost never use the supplied A3 carry handles and if they are an extra, I dont buy them.. They are handy to have as a stow away pre sighted, just incase both the red dot or scope and back up iron sight is somehow damaged, but that is very unlikely.
Sorry if this is not very percise, just do some research and you'll get a better idea of what you want.
You can use the search feature on the upper right corner of the screen to find a vast amount of information and insight. just click on it and type in what you want to find info on an search.0 -
Yes, Quickmajic is right. If the power is 2.5x or higher you should not see anything. At most a small blur that will disappear at 4 like Quick says. 0 -
I have a Millett DMS-1 1x4 power scope on my Stag AR.
At 1 power I can see the front sight though it doesn't bother me.
Anything above 1 power the front sight 'disappears' totally.
Don't worry about the front sight getting in the way. You won't notice it hardly any at all.
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Thanks to everyone for the replies; I learned a lot about the AR15 here in this forum, especially the front sight issue (which is basically a non-issue). Can't wait to build the next few rifles. Thanks again. 0 -
I use a 1.5-4.5x scope on this type of upper and with my scope the front sight is a significant distraction to precise aiming. I am seriously considering swapping the FSB for one with a rail so I still have the option of battle sights at a later date. 0 -
O.K., I'll admit that I didn't do any research before I bought a bunch of AR parts, so I have to ask: what does FSB and BUIS mean? After buying enough parts to build 6 rifles, I should know this, but I don't....thanks again. 0 -
FSB=front sight base 0 -
BUIS - Backup Iron Sight 0 -
One last question-regarding uppers, what are "M4 feed ramps"? thanks! 0
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