New Posts New Posts RSS Feed - Help needed
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Check GunBroker.com for SWFA's No Reserve and No Minimum bid firearm auctions.

Help needed

 Post Reply Post Reply   Topic Search Topic Search  Topic Options Topic Options
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/25/2012 at 09:02
tmvikings View Drop Down
Optics GrassHopper
Optics GrassHopper
Avatar

Joined: August/31/2010
Location: Prior Lake
Status: Offline
Points: 6
Need help I have a 6.5 grendel AA24 inch barrel riding a rock river arms lower, also a Nikon Monarch 4-16x42 scope attached by a rock river arms solid piece cantilever scope mount. Today I went to the range first time with it so I started at 50 yards I also should say the scope and mount were on my 223 and it was dead on. I’m a foot low and the elevation is maxed out do I just need to buy a shim for the rail and if so what type. Tried her at 100 and same thing foot low need some ideas on how to fix this. First I thought my the elevation spring was stuck but the recital moves just fine. 
Would buying a new mount that is alot lower to the barrel help IMAG0651.jpg
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/25/2012 at 10:13
Rancid Coolaid View Drop Down
Optics Jedi Master
Optics Jedi Master
Avatar

Joined: January/19/2005
Location: United States
Status: Offline
Points: 7692
A picture would help immensely.

Shimming is usually a bad idea, these issues typically result from something being installed incorrectly or something not working as it should.

Post a picture.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/25/2012 at 13:41
Jon A View Drop Down
Optics Journeyman
Optics Journeyman
Avatar

Joined: March/14/2008
Location: Everett, WA
Status: Offline
Points: 660
The height of the mount matters very little.  However, a new mount may fix your problem.  One of the problems with the really cheap mounts is that frankly they're sometimes just not made very straight.  There can also be barrel to upper junction issues that cause some AR's to throw the bullets off center a little bit.  That scope is so limited in travel you have little margin for error.

The next step is to figure out exactly what the problem is.  The easiest way to do that is to try a different mount.  If the rounds land in the same place or close, it's likely a rifle issue.  If the problem is fixed, well, there you go.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/25/2012 at 14:47
tmvikings View Drop Down
Optics GrassHopper
Optics GrassHopper
Avatar

Joined: August/31/2010
Location: Prior Lake
Status: Offline
Points: 6
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/25/2012 at 14:49
tmvikings View Drop Down
Optics GrassHopper
Optics GrassHopper
Avatar

Joined: August/31/2010
Location: Prior Lake
Status: Offline
Points: 6
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/25/2012 at 15:02
Alan Robertson View Drop Down
Optics Master
Optics Master
Avatar

Joined: October/31/2009
Location: Oklahoma
Status: Offline
Points: 1721
The height above the barrel doesn't have any influence on your problem and the RR cantilever is co-witness. ARs just about need that height for proper/comfortable cheek weld.

If it shoots the same amount low at 50 yds and 100 yds, then...
Did the impact actually change when you adjusted elevation?

Are both mount cross bolts bottomed in the rail slots?
Is mount flush to top of rail at front and rear?
Is the mount attached to rail on receiver only and not to rail on handguard also?
Have you tried moving the whole shebang forward/backward one or more slots?
Is there clearance between ring and turret housing?
Did the scope lay flat/level/straight/not canted in the rings before caps put on?
Have you tried that scope and/or mount on another rifle/upper?
Do you have iron sights or another scope you could try on that upper?

The 2 bolts which attach the RR mount to your rail have to be bottomed out before torque- down is really effective. The thru- bolts are pressed into the mount and ultimately bottom against a shoulder, making them solid. If the bolts were merely pressed in and not bottomed at the factory (it could happen) then there can be a false tight spot and mount will not be solid.
Look at the little round bolt heads and make sure that both are sunken below flush 1/32".

RRA mounts are heavy tactical and quite capable of crushing/distorting your tube if over torqued- wouldn't use more than 15 inch-lbs. on the ring screws.

If it turns out to be the mount (doubtful- they're tanks), then RRA customer service will make it good- their cs is as good as it gets.

In this pic you can see how the mount is flush with rail and see the cross bolt 1/32" detent. Note, this is not the cantilever mt:


Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/26/2012 at 22:25
Alan Robertson View Drop Down
Optics Master
Optics Master
Avatar

Joined: October/31/2009
Location: Oklahoma
Status: Offline
Points: 1721
tmvikings,
I should have added- be sure and let us know what you find and help increase the knowledge pool, thanks.

I know that some of the questions asked are pretty basic and no offense was meant. People with all levels of understanding read the posts.
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Similar Threads: "Help needed"
Subject Author Forum Replies Last Post
HELP NEEDED FOR AIRGUN SCOPE higicir Rimfire / Airgun 6 2/13/2006 3:17:32 PM
Scope comparison. Help needed OK hunter Rifle Scopes 6 12/13/2005 1:30:28 PM
Help needed choosing rings Tityus Rings and bases 2 2/6/2006 7:31:37 AM
help needed picking new scope gabby1 Rifle Scopes 2 4/7/2006 2:09:30 PM
Nikon scope selection help needed 2xmaduro Rifle Scopes 7 3/16/2007 2:20:55 PM
Bushnell Elite 4200 help needed modo_dk Rifle Scopes 10 4/24/2007 6:37:53 PM
Duplex loads Help needed 8shots Reloading & Ballistics 58 9/26/2007 12:03:15 AM
Trijicon mount for bolt action - help needed principsd Tactical Scopes 4
Scope Mount help needed dkevinbarnes Rings and bases 1
Help needed on scope rings?? grea2278 Rifle Scopes 2


This page was generated in 0.426 seconds.