Home Forums Classifieds Blogs Today's Posts Search Social Groups



  
SIGN-UP
Notices

Glock Talk
Welcome To The Glock Talk Forums.

 
  
Reply
 
Thread Tools Display Modes
Old 01-23-2010, 23:44   #1
D.S.Brown
Senior Member
 
D.S.Brown's Avatar
 
Join Date: Dec 1999
Location: North Texas
Posts: 1,326
Battle sight zero ?'s

I have a CMMG 16" Mod 4. Decent rifle but one problem: My Zero.

I followed the instructions to conduct a 25 meter zero. I was shooting from a rest the entire time. All of my shots were grouping nicely, just to the far bottom left corner of my rifle target.

I had to drop the front sight 13 clicks to raise the strike of the round to the proper elevation. What concerns me the most is the rear sight had to be moved 30+ clicks to the right from center. I might have 10 or 12 clicks of adjustment left on the right side. My rear sight appears very far the right.

It is NOT my trigger control because once I made these adjustments I was dialed in dead center on the target consistently.

My concerns. It has been nearly 20 years since my time in the Army. I don't remember making such dramatic adjustments, especially with windage. I understand that I am 42 and not 22, but still I don't think it is my sight, which is quite good.

I spoke to other people at the range who own the same model of CMMG. They are not reporting having to make such adjustments with iron sights. I plan to return to the battlesight zero and have friends shoot to see if they too are so dramatically off.

CMMG says that I can send it back and they will take a look because it is covered by warranty.

Has anyone else dealt with this type of issue? If other people's rifles of the same make are not having these issues, is it possible I a rifle that slipped through QC?

I know it is limited info, but any insights would be appreciated. Thanks,

Best,

Dave
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.
D.S.Brown is offline   Reply With Quote
Old 01-24-2010, 06:31   #2
faawrenchbndr
CLM Number 281
The Dude Abides
 
faawrenchbndr's Avatar
 
Join Date: Nov 2005
Location: east of East St. Louis
Posts: 34,289
Contact CMMG,.....it sounds as if yout FSB is canted.
faawrenchbndr is offline   Reply With Quote
Old 01-24-2010, 06:36   #3
D.S.Brown
Senior Member
 
D.S.Brown's Avatar
 
Join Date: Dec 1999
Location: North Texas
Posts: 1,326
faawrenchbndr,

What is an FSB, I think it means Front Sight B........? Thank you.

Best,

Dave
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.
D.S.Brown is offline   Reply With Quote
Old 01-24-2010, 06:54   #4
faawrenchbndr
CLM Number 281
The Dude Abides
 
faawrenchbndr's Avatar
 
Join Date: Nov 2005
Location: east of East St. Louis
Posts: 34,289
Sorry,......frone sight base.

DPMS and a few others had a big issues with this a few years ago.
Seems the front sight base was fitted/reamed/pinned crooked in
relation to the barrel alignment pin.
faawrenchbndr is offline   Reply With Quote
Old 01-24-2010, 06:57   #5
D.S.Brown
Senior Member
 
D.S.Brown's Avatar
 
Join Date: Dec 1999
Location: North Texas
Posts: 1,326
Thanks again sir.

Best,

Dave
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.
D.S.Brown is offline   Reply With Quote
Old 01-24-2010, 14:30   #6
JBaird22
Senior Member
 
JBaird22's Avatar
 
Join Date: Nov 2005
Location: Washington
Posts: 2,648
I know of an individual who had two different uppers from CMMG that had their front sight base canted. I am not bashing them (I have one of their guns) but they seem to have this problem frequently.
__________________
I'm game though....

Former Certified Super Glock fixer
JBaird22 is offline   Reply With Quote
Old 01-25-2010, 22:26   #7
D.S.Brown
Senior Member
 
D.S.Brown's Avatar
 
Join Date: Dec 1999
Location: North Texas
Posts: 1,326
The rifle goes back to CMMG on Wednesday. Thanks again all.

Best,

Dave
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.
D.S.Brown is offline   Reply With Quote
Old 01-25-2010, 22:50   #8
AK_Stick
AAAMAD
 
AK_Stick's Avatar
 
Join Date: Jan 2004
Location: Alaska, again (for now)
Posts: 20,966
Send a message via AIM to AK_Stick Send a message via Yahoo to AK_Stick
also check to see if your front sight post itself is bent. I had this with 3 new M-4s before we went to Kosovo.
__________________
Quote:
Thomas Paine:

"If there must be trouble, let it be in my day, that my children may have peace"
AK_Stick is offline   Reply With Quote
Old 01-28-2010, 18:54   #9
hasselbach
Senior Member
 
Join Date: Dec 2009
Location: Middle of Texas
Posts: 606
Use a laser sight initially to set your windage, it will tell you if your FSB is cocked early on.
hasselbach is offline   Reply With Quote
Old 01-28-2010, 21:12   #10
faawrenchbndr
CLM Number 281
The Dude Abides
 
faawrenchbndr's Avatar
 
Join Date: Nov 2005
Location: east of East St. Louis
Posts: 34,289
Quote:
Originally Posted by AK_Stick View Post
also check to see if your front sight post itself is bent. I had this with 3 new M-4s before we went to Kosovo.


Wow, I would have never thought of that!
faawrenchbndr is offline   Reply With Quote

 
  
Reply

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 -6. The time now is 03:04.




Homepage
FAQ
Forums
Calendar
Advertise
Gallery
GT Wiki
GT Blogs
Social Groups
Classifieds


Users Currently Online: 582
113 Members
469 Guests

Most users ever online: 2,672
Aug 11, 2014 at 2:31