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-   -   help with optic please (http://www.firearmstalk.com/forums/f20/help-optic-please-66709/)

hawkguy 06-19-2012 05:50 PM

help with optic please
 
a quick question. please understand i am very new to AR's, so please forgive if this is a DUH type of question....

i have a millet red dot. a 1" tube red dot. here is a link.

http://www.opticsplanet.net/millet-electronic-red-dot-sights.html

bought it as a cheap red dot for my mini 14, i haven't used it much, but it seems to be a decent red dot imo.

my question is....how can i use this on my S&W M&P sport? it is too low to clear my front post on regular rings.

i will need some type of elevated mount for a picatinny rail. it needs to be with 1" scope rings. could i co-witness with my irons with this optic? i would like to go pretty inexpensive if possible. one day i hope to have an eotech on my AR, but that might be in the distant future....$$$$:eek:

it would be really nice to use an optic i already have for awhile.

thanks for any help.

EW1066 06-19-2012 06:16 PM

Take a look at this.

http://www.amazon.com/NcStar-Weaver-Cantilever-Inserts-MARCQ/dp/B003EL97V0/ref=sr_1_6?ie=UTF8&qid=1340129696&sr=8-6&keywords=ncstar+riser

EDUB

hawkguy 06-19-2012 06:21 PM

thank you. i was actually just about to post a link to this on midway when i saw you posted this. it says it is a "weaver mount"....will it work on a picatinny rail?

the price is right! :D

but my question would be....how do i know if this will clear/co-witness with my standard front sight? this is something i simply don't understand about ARs....:confused:

EW1066 06-19-2012 06:44 PM

Based solely on the product pictures, it appears as though you will get either a lower 1/3rd co-witness or maybe even an absolute co-witness. It's a little difficult to tell from just the pictures.

From the NCSTAR web site:

"Introducing the most Versatile Mount to the NcSTAR Line-up. This Single Accessory will allow you to mount virtually any rifle scope of red dot sight to your rifle in a number of different configurations. The Famous NcSTAR QR Lever System makes mounting the MARCQ to your flat top Lightning Fast. The Rings are 30mm with 1 inch inserts, and the Rear Ring rides on a dovetail so you can adjust the spacing for customized fit. The Rear Ring is also removable so you can set up your Red Dot Sight to Co-witness with your Iron Sights. Made of Hard Anodized Aluminum and Solid Steel, once you’re locked in this mount isn’t going anywhere!"

EDUB

hawkguy 06-19-2012 06:52 PM

Quote:

Originally Posted by EW1066 (Post 841895)
Based solely on the product pictures, it appears as though you will get either a lower 1/3rd co-witness or maybe even an absolute co-witness. It's a little difficult to tell from just the pictures.

From the NCSTAR web site:

"Introducing the most Versatile Mount to the NcSTAR Line-up. This Single Accessory will allow you to mount virtually any rifle scope of red dot sight to your rifle in a number of different configurations. The Famous NcSTAR QR Lever System makes mounting the MARCQ to your flat top Lightning Fast. The Rings are 30mm with 1 inch inserts, and the Rear Ring rides on a dovetail so you can adjust the spacing for customized fit. The Rear Ring is also removable so you can set up your Red Dot Sight to Co-witness with your Iron Sights. Made of Hard Anodized Aluminum and Solid Steel, once youíre locked in this mount isnít going anywhere!"

EDUB

thanks again for your help.

i have seen this 1/3 vs absolute c0-witness mentioned before, but i don't understand it at all. could you please explain the difference?

EW1066 06-19-2012 08:08 PM

Look at post #17 in the thread I've linked to below from another forum. That's the best way to visualize the difference between lower1/3 and absolute co-witness.

http://www.m4carbine.net/showthread.php?t=26378

EDUB

EW1066 06-19-2012 08:19 PM

Or watch this video:


EDUB

purehavoc 06-19-2012 08:23 PM

http://img.photobucket.com/albums/v5...r/cowit1-1.jpg

hawkguy 06-19-2012 08:38 PM

thanks, gentlemen!

now, how do you know which type of co-witness you will get with a specific optic/mount? is it an adjustment to the scope or more related to your set up/hardware? in what ways can you acheive the co-witness you prefer?

sorry for so many ?'s.

Quentin 06-19-2012 09:14 PM

Normally you chose a mount/riser that gives you the right height for cowitness. A taller mount is required for bottom 1/3 than absolute. Look at Purehavoc's diagram and decide which you want. I like bottom 1/3 myself but many like absolute.


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