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Schumania 06-04-2009 04:45 PM

Need Help
 
Looking for assistance on how I go about removing the front sight on my AR-15. Want to mount a scope on upper receiver, (dont want paralex problem) and also need to install BUIS.

robocop10mm 06-05-2009 02:45 AM

Front sight should not cause any real problems with sight picture. Parallax has nothing to do with intermediate objects. If you REALLY want to do so, you can get a rail topped gas block. Cross pin secures the front sight post/gas block.

jeepcreep927 06-05-2009 04:30 AM

The pins are slightly tapered. Punch them out left to right, if I remember right. :confused:

crockett007 06-05-2009 02:36 PM

Quote:

Originally Posted by Schumania (Post 113175)
Looking for assistance on how I go about removing the front sight on my AR-15. Want to mount a scope on upper receiver, (dont want paralex problem) and also need to install BUIS.

I think you are on the wrong track here. I would advise against removing the front sight post.
First..Parallax.......
TWO FACTORS WHICH CAUSE AND DETERMINE THE AMOUNT OF PARALLAX IN A RIFLESCOPE:

1. The distance of the target to the objective--The objective lens forms a primary image of the subject being viewed and subsequent components invert the image, and there is no parallax. The actual position at which the image is formed is dependent on the distance the target is from the objective. Closer targets are formed farther away from the objective and farther targets are formed closer to the objective. Since the reticle is in a fixed position within the scope housing, the image is not always formed in the same plane as the reticle and, hence parallax.

2. The distance the eye can move from the optical axis of the scope, is determined by exit pupil size. There is no parallax, at any distance, as long as the eye is lined up exactly with the optical axis of the scope. An exit pupil small enough to do this would be impractical. It is important to know that in every scope, there is some parallax. It is also important to know that in every scope, there is some one shooting distance at which there is no parallax. In most rifle scopes this one point of zero parallax is usually placed at a suitable mid-range point in the scopes' focal range.

In lower-quality scopes, there are other sources of parallax. If the reticle is not precisely placed the correct distance from the objective, the distance of no parallax will be exaggerated. Reticles that are not securely mounted and allowed to move even a few thousandths of an inch, will always have changing amounts of parallax. Parallax is also caused by optical deficiencies in the objective, either by design or manufacture. If spherical or astigmatic aberrations have not been corrected, images will form a considerable distance from the reticle. If you see a scope in which the apparent movement of the reticle compared with the image viewed is different from when you move your eye up and down than when you mover your eye side to side, it is because of a bad objective. No adjustment of the scope will eliminate these faults or optical deficiencies.

You can check the parallax of any scope by sighting an object at normal shooting distance (not indoors), by moving your eye side to side (then up and down), as far as you can, keeping the sighted object within the field of view. The apparent movement of the reticle in relation the target is parallax.


With the A2 stock, you will need some type of riser or raised weaver ring to obtain an acceptable cheek weld. The fron sight post will not be visible thru 4X and up.

If you co-witness with BUIS, you are guaranteed to use either a see through riser or see through rings.

Schumania 06-05-2009 07:55 PM

alright what is happening is that I remove the carry handle and mount the red dot onto the upper receiver. When I look through the scope all I see is the front sight (not the target). So either I remove the front sight (which I m second guessing now) or I need some sort of "rise" to mount optic on top of so the optic is flush with the front sight post.


In this case where can I find a "mount" to place on top of upper receiver to elevate my optics so the the front sight is no long in the way. Also what size will i need (height difference)?

matt g 06-05-2009 08:23 PM

Quote:

Originally Posted by Schumania (Post 113665)
alright what is happening is that I remove the carry handle and mount the red dot onto the upper receiver. When I look through the scope all I see is the front sight (not the target). So either I remove the front sight (which I m second guessing now) or I need some sort of "rise" to mount optic on top of so the optic is flush with the front sight post.


In this case where can I find a "mount" to place on top of upper receiver to elevate my optics so the the front sight is no long in the way. Also what size will i need (height difference)?

Mount the scope to the carry handle. It'll allow for a more natural cheek weld, and one that you're already accustomed to. ARs with the scopes mounted straight to the receiver force the head and neck into an unnatural position.

canebrake 06-05-2009 08:54 PM

Any of these work?

Pro 20mm Weaver Scope Mount Rail For Carry Handle 15A - eBay (item 280291688603 end time Jul-02-09 09:39:18 PDT)

Pro 3 side 20mm Rail See Through Scope Mount base 15D - eBay (item 250337293955 end time Jul-02-09 09:39:20 PDT)

SpiderFire QD M4 Rear Sight w/ 20mm Scope Rail Pro M012 - eBay (item 280291689555 end time Jul-02-09 09:43:21 PDT)

Spiderfire 3 side Tri Rail 25mm / 30mm Scope Mount Pro - eBay (item 280291689212 end time Jul-02-09 09:41:55 PDT)

Tactical Raising 20mm Weaver Rail Scope Mount Base #15B - eBay (item 280291690708 end time Jul-02-09 09:47:25 PDT)

Schumania 06-07-2009 04:49 AM

thx for input guys

M14sRock 06-07-2009 06:10 AM

A standard Picatinny extension riser should work for you. Here is a 1" cheapie, but there are higher quality avail. CAA FTRM Flat Top Riser Mount [CAA-FTRM] - $19.95 : Area 51 Tactical, 334 375-7153

Yankee Hill makes a 1/2" riser that is reasonably priced. Model 1 Sales

Or, try an Aimpoint in LaRue 150 mount. The combo price from LaRue is a very good deal. It will allow you to use the Ap with the standard front sight post.

Going Postal 06-08-2009 02:42 AM

I have a riser that is about 1 inch high, I would thaink that should take care of getting the scope/reddot above the front sight. My Bushmaster does have the fold down front sight on it, but I still have the scope mounted to that riser.


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