1911Forum
Forum   Reviews   Rules   Legal   Site Supporters & Donations   Advertise


Go Back   1911Forum > 1911 Manufacturers > Rock Island Armory


Reply
 
Thread Tools Display Modes
  #1  
Old 05-25-2012, 08:39 AM
palmetto99 palmetto99 is offline
Member
 
Join Date: May 2011
Posts: 114
Drifting The Tactical Rear Sight




I'm in the process of breaking in my new "Tactical". The gun is grouping well, but shooting to the left. I took a close look at the rear sight and it is off set to the left of the slide.

Will I need to use a hammer and drift/dowel to move the sight to the right once the screw has been loosened, OR will I be able to push it with my fingers? Trying to determine what tools to bring to the range next time I go.

Thanks folks.
Reply With Quote
  #2  
Old 05-25-2012, 09:04 AM
NIGHT AL NIGHT AL is offline
Senior Member
 
Join Date: Apr 2006
Location: K.C.MO.
Posts: 5,019
Forget your fingers, do it at home, use a vice,and drift, take it to the range after you get it loose, then do your sighting in.
Reply With Quote
  #3  
Old 05-25-2012, 11:13 AM
gamma72 gamma72 is offline
Member
 
Join Date: Nov 2011
Location: North of Seattle, WA
Posts: 578
I'm pretty sure to move your groups to the right you'll need to drift the REAR sight to the left and if you want to move the front, then you have to drift it to the right.
__________________
HMC (AW/SW) USN Retired

Bushmaster ORC in 5.56, DPMS Panther Bull 20 in .223, Citadel 1911FS in 45ACP, Rock Island Armory 1911FS in 9mm, M&P FS in 9mm, S&W 22A in 22LR

Last edited by gamma72; 05-25-2012 at 11:19 AM.
Reply With Quote
  #4  
Old 05-25-2012, 11:19 AM
GunBugBit GunBugBit is offline
Senior Member
 
Join Date: Aug 2009
Location: Arizona
Age: 55
Posts: 4,372
Dawson Precision sells an aluminum punch with a nylon tip that's just for rear sights. I find it's just the ticket for drifting my 1911 fixed rear sights. Far easier to use than a sight pusher and quite effective.
__________________
Remember Delbert "Shorty" Belton.
Reply With Quote
  #5  
Old 05-25-2012, 12:58 PM
gb6491 gb6491 is offline
Member
 
Join Date: Jan 2008
Location: Yuma County, Arizona
Posts: 231
Quote:
Originally Posted by gamma72 View Post
I'm pretty sure to move your groups to the right you'll need to drift the REAR sight to the left and if you want to move the front, then you have to drift it to the right.
I'm probably reading that wrong, but say your shots are hitting to the left of where you are aiming, then you would need to move your rear sight to the right to correct that. So, move the rear the way you want the bullet's impact to move (IE, elevate it to bring the impact up, move it right to move the impact right). The front sight works the opposite as in move it the opposite direction from where you want the bullet to impact (IE, a shorter front sight will move the bullet's impact point up, moving the sight to the left will move impact to the right).
The sights on my RIA 9mm Tactical had Locitite (or some such thread locker) on them, so a little heat was needed to aid in moving them.
Regards,
Greg

Last edited by gb6491; 05-25-2012 at 01:02 PM.
Reply With Quote
  #6  
Old 05-25-2012, 06:44 PM
Cappi Cappi is offline
Senior Member
 
Join Date: Sep 2010
Posts: 6,024
worth repeating



Quote:
move the rear the way you want the bullet's impact to move
cause that's the easiest, simplest way to say and think it


.l.T.A.
__________________
K.I.S.S.
Reply With Quote
  #7  
Old 05-27-2012, 08:28 AM
palmetto99 palmetto99 is offline
Member
 
Join Date: May 2011
Posts: 114
Let me add some thing to the original question. Does the rear sight cut change width? It appears that the cut narrows from left to right. I used a mic to check.
Reply With Quote
  #8  
Old 09-11-2012, 11:21 AM
Vospertw Vospertw is offline
Junior Member
 
Join Date: Feb 2012
Posts: 8
Reviving an older post with a related question - anyone have a rough idea of how much of a drift is required to move an inch at say, 25 yards? I know it won't be precise like a scope but thought a rough idea might be helpful for making an initial adjustment at home.
Reply With Quote
  #9  
Old 09-11-2012, 01:24 PM
Road Rat Road Rat is offline
Member
 
Join Date: Sep 2009
Location: Eastern Iowa
Posts: 483
Quote:
Originally Posted by gamma72 View Post
i'm pretty sure to move your groups to the right you'll need to drift the rear sight to the left and if you want to move the front, then you have to drift it to the right.

aaaahhhhhhhhhhhhhh................................ ...
Reply With Quote
  #10  
Old 09-11-2012, 05:19 PM
Giesterfarher Giesterfarher is offline
Member
 
Join Date: Jul 2012
Location: Peoples Soviet Socialist Republic of California
Posts: 370
Quote:
Originally Posted by Cappi View Post
worth repeating


Quote:
move the rear the way you want the bullet's impact to move

cause that's the easiest, simplest way to say and think it


.l.T.A.
aaaahhhhhhhhhhhhhh................................ ...
__________________
Hammer Your Swords Into Plowshares, And You Will Plow For Those Who Do Not...

ROCK ISLAND ARMORY FS TACTICAL .45ACP
Reply With Quote
  #11  
Old 09-11-2012, 07:40 PM
AndyC's Avatar
AndyC AndyC is offline
Senior Member
 
Join Date: May 2009
Location: Dallas, TX
Age: 49
Posts: 4,597
Quote:
Originally Posted by Vospertw View Post
Reviving an older post with a related question - anyone have a rough idea of how much of a drift is required to move an inch at say, 25 yards? I know it won't be precise like a scope but thought a rough idea might be helpful for making an initial adjustment at home.
Yes, there's a formula - but it depends on the weapon's sight-radius. Let's assume a 1911 with a 6-inch sight-radius (distance between the back of the front-sight to the back of the rear-sight).

error X sight radius
------------------------ = adjustment to sight
Target distance in inches


so...

1 inch X 6 inch sight radius
------------------------ = adjustment to sight
900 inches (25 yds in inches)

6
----
900

0.0066"

or call it a 7-thou' movement in the sight to change POI by 1" at 25 yards.

As for the sight direction, there's an old Army acronym - FORS. It stands for Front - Opposite, Rear - Same.

In other words, if you're moving the front sight for whatever reason, move it in the opposite direction that you want the group to move ie. if you want the group to move right, move the front sight left. If you want the group to hit higher, move the front sight lower, etc.

That confuses some folks, so "Rear - Same" is easier to remember. Want to group more to the left, move the rear sight left. To group higher, move the rear sight higher - etc, etc.
__________________
My Iraq Pics

Preferred Travel Agent - 72 Virgins Dating Club

Last edited by AndyC; 09-11-2012 at 07:47 PM.
Reply With Quote
  #12  
Old 09-11-2012, 09:11 PM
Dave Waits Dave Waits is offline
Senior Member
 
Join Date: Aug 2010
Location: Loveland, Ohio
Posts: 4,114
Quote:
Originally Posted by gamma72 View Post
I'm pretty sure to move your groups to the right you'll need to drift the REAR sight to the left and if you want to move the front, then you have to drift it to the right.

sir, that is backwards.
__________________
Diligentia, Vis, Celeritas
Jeff Cooper
COTEP#CBOB0428
Msgt., USAF,Ret.
Reply With Quote
  #13  
Old 09-11-2012, 10:09 PM
Tommy Kelly Tommy Kelly is offline
Member
 
Join Date: Jan 2005
Posts: 169
Always move the rear the way you want the bullet to move. move the front opposite. It's been that way forever and at 25 yds to move the group 1" will take very little movement at all. I have replaced the sights on 3 of my rock Islands and all have been centered on the slide for poa poi. I stayed with fixed sights just went to a wider profile.
Reply With Quote
  #14  
Old 09-12-2012, 12:31 PM
Vospertw Vospertw is offline
Junior Member
 
Join Date: Feb 2012
Posts: 8
AndyC - perfect! Exactly what I was looking for, thanks amigo!
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 05:36 AM.


NOTICE TO USERS OF THIS SITE: By continuing to use this site, you certify that you have read and agree to abide by the Legal Terms of Use. All information, data, text or other materials ("Content") posted to this site by any users are the sole responsibility of those users. 1911Forum does not guarantee the accuracy, integrity, or quality of such Content.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 2011 1911Forum.com, LLC. All Rights Reserved