M 77RS problem

Stephen Hurst · January 31, 2021, 11:56 AM

I own a M77RS with extragal scope bases milled in the receiver. They are milled at a angle. Barrel looks north, scope looks northeast. I have no problem with drilling and taping the receiver. But what bases would I use. Yes that sounds very strange. Need help. Stephen

JJ45 · January 31, 2021, 03:49 PM

Quote:

Originally Posted by Stephen Hurst

I own a M77RS with extragal scope bases milled in the receiver. They are milled at a angle. Barrel looks north, scope looks northeast. I have no problem with drilling and taping the receiver. But what bases would I use. Yes that sounds very strange. Need help. Stephen

That's a weird one....I assume you are using other than ruger rings that might not have been furnished from wherever you got the rifle....

RS means rings and sights in the old Ruger Tang safety series, ST models had sights only and took the same bases as the Remington M700 which are easy to find. Rs are rings only, no sights, Ruger rings shipped with the rifle when new......I'm not sure about the MKIIs and there are other models of both Marks that may have different letter designations, like RL for Ultra Light, etc..

Are you sure it's the RS? If so it takes special Ruger rings that were usually provided by the factory when and if the rifle was purchased new.

Stephen Hurst · January 31, 2021, 09:30 PM

Thank you for your help. I have tried different rings, I have talked to the factory. Ruger no longer works on M77’s at all, big zero. I am a retired machinist. The barreled action has been put on a Bridgeport mill and checked with dial indicators. Action has problems.
I need bases that are flat on bottom. A Marlin 336 base would work but way to short, tried it. Stephen

Scorch · January 31, 2021, 11:01 PM

Couple of options:
1- get a set of Millett Angle-Loc rings for your M77, they are windage adjustable. I have never seen a receiver so far out of true that these rings could not fix. They use the factory base notches so no drilling is required.
2- get a set of Leupold gunsmith blank bases and machine them to fit your receiver.
3- get a length of Picatinny rail and machine it to fit your receiver. You can buy either steel or aluminum.

Stephen Hurst · February 1, 2021, 10:42 AM

Thank you. Never heard of the leupold base blanks. They will work.

bamaranger · February 11, 2021, 01:18 AM

Wait......before you mod your rifle, have you tried different sets and combos of Ruger rings? I have a 77/22 that displayed the same issue, not enough windage adjustment in my scope to get zeroed. By experimenting with different sets/combos of Ruger rings, I eventually got the right mix and good to go.
Gun shop gossip indicates this is not a rare problem, essentially tolerance stack between rings and receivers.

Jim Watson · February 11, 2021, 11:53 AM

You could spend a lot of time and money looking for rings crooked in the opposite direction.
Sounds like the Milletts are the way to go.

My crooked Winchester benefited from the Burris rings with offset insert set.

**4V50 Gary** · February 11, 2021, 01:09 PM

If you're a machinist, you can machine crooked bases to fit the crooked mountings that will make the scope straight with boreline?

Me? I'd mill the top and then make custom bases.

January 31, 2021, 11:56 AM	#1
Stephen Hurst Junior Member Join Date: January 15, 2021 Posts: 3	M 77RS problem I own a M77RS with extragal scope bases milled in the receiver. They are milled at a angle. Barrel looks north, scope looks northeast. I have no problem with drilling and taping the receiver. But what bases would I use. Yes that sounds very strange. Need help. Stephen

January 31, 2021, 09:30 PM	#3
Stephen Hurst Junior Member Join Date: January 15, 2021 Posts: 3	Reply Thank you for your help. I have tried different rings, I have talked to the factory. Ruger no longer works on M77’s at all, big zero. I am a retired machinist. The barreled action has been put on a Bridgeport mill and checked with dial indicators. Action has problems. I need bases that are flat on bottom. A Marlin 336 base would work but way to short, tried it. Stephen

January 31, 2021, 11:01 PM	#4
Scorch Senior Member Join Date: February 13, 2006 Location: Washington state Posts: 15,248	Couple of options: 1- get a set of Millett Angle-Loc rings for your M77, they are windage adjustable. I have never seen a receiver so far out of true that these rings could not fix. They use the factory base notches so no drilling is required. 2- get a set of Leupold gunsmith blank bases and machine them to fit your receiver. 3- get a length of Picatinny rail and machine it to fit your receiver. You can buy either steel or aluminum. __________________ Never try to educate someone who resists knowledge at all costs. But what do I know? Summit Arms Services Last edited by Scorch; January 31, 2021 at 11:29 PM.

February 1, 2021, 10:42 AM	#5
Stephen Hurst Junior Member Join Date: January 15, 2021 Posts: 3	To Mr. Scorch Thank you. Never heard of the leupold base blanks. They will work.

February 11, 2021, 01:18 AM	#6
bamaranger Senior Member Join Date: October 9, 2009 Location: North Alabama Posts: 8,308	Ruger rings Wait......before you mod your rifle, have you tried different sets and combos of Ruger rings? I have a 77/22 that displayed the same issue, not enough windage adjustment in my scope to get zeroed. By experimenting with different sets/combos of Ruger rings, I eventually got the right mix and good to go. Gun shop gossip indicates this is not a rare problem, essentially tolerance stack between rings and receivers.

February 11, 2021, 11:53 AM	#7
Jim Watson Senior Member Join Date: October 25, 2001 Location: Alabama Posts: 18,542	You could spend a lot of time and money looking for rings crooked in the opposite direction. Sounds like the Milletts are the way to go. My crooked Winchester benefited from the Burris rings with offset insert set.

February 11, 2021, 01:09 PM	#8
4V50 Gary Staff Join Date: November 2, 1998 Location: Colorado Posts: 21,838	If you're a machinist, you can machine crooked bases to fit the crooked mountings that will make the scope straight with boreline? Me? I'd mill the top and then make custom bases. __________________ Vigilantibus et non dormientibus jura subveniunt. *Molon Labe!*