The Original CZ Forum

CZ LONG ARMS => CZF RIMFIRES => Topic started by: benscratchin on October 30, 2018, 12:41:51 PM

Title: CZ 455 Scope ring base options?
Post by: benscratchin on October 30, 2018, 12:41:51 PM
I recently purchased a CZ 455 Varmit Evolution rifle. I installed Burris Signature Rimfire Zee rings using a Burris 4-16X40 scope. The rings walked clean off the receiver cut rail on the first outing. I repositioned the scope and shot another 50 rounds or so before I left for the day.
I can see the rings are again moving on the rail. What are my options? Should I drill and tap the receiver for a Picatinny rail?
Title: Re: CZ 455 Scope ring base options?
Post by: Blackwatch on October 30, 2018, 01:58:27 PM
I'm using BKL 1 inch rings, medium, 11mm dovetail...bolt handle clearance is fine and rock solid mount.
Title: Re: CZ 455 Scope ring base options?
Post by: benscratchin on October 30, 2018, 03:11:07 PM
I'm using  the Burris rings for the Rimfire/CZ grooved receiver. Maybe I need to re-clean everything and tighten the ring bases more?
Title: Re: CZ 455 Scope ring base options?
Post by: painter on October 30, 2018, 04:57:58 PM
I'm using  the Burris rings for the Rimfire/CZ grooved receiver. Maybe I need to re-clean everything and tighten the ring bases more?
Did you use the correct clamp for the 11mm dovetail?

What part# are your rings?
Title: Re: CZ 455 Scope ring base options?
Post by: Phlyers13 on October 30, 2018, 07:47:13 PM
I'm using  the Burris rings for the Rimfire/CZ grooved receiver. Maybe I need to re-clean everything and tighten the ring bases more?
Did you use the correct clamp for the 11mm dovetail?

What part# are your rings?

This is probably the issue. You need to make sure you reverse the clamp to get etc the 11mm fit vs the 3/8.
Title: Re: CZ 455 Scope ring base options?
Post by: benscratchin on October 30, 2018, 08:15:32 PM
I'm using  the Burris rings for the Rimfire/CZ grooved receiver. Maybe I need to re-clean everything and tighten the ring bases more?
Did you use the correct clamp for the 11mm dovetail?

What part# are your rings?

This is probably the issue. You need to make sure you reverse the clamp to get etc the 11mm fit vs the 3/8.

I'm using Burris item # 420556 Signature .22 rings.
Yes, for sure the dovetail clamps are correct.
Clamps are stamped so you can't mix them up. If you use the 3/8 where 11mm is correct, it is a visual mismatch.
I'm hoping I just didn't clean well enough with alcohol the clamps and the grooves on the receiver, well enough and need to tighten more?
Title: Re: CZ 455 Scope ring base options?
Post by: Jiva on October 30, 2018, 08:30:59 PM
Sounds like you need to tighten them more. There’s nothing else about the 455 that would cause them to come loose like that, unless you’re runnin’ through the woods bangin’ it on trees :P
Title: Re: CZ 455 Scope ring base options?
Post by: benscratchin on October 30, 2018, 08:43:44 PM
Sounds like you need to tighten them more. There’s nothing else about the 455 that would cause them to come loose like that, unless you’re runnin’ through the woods bangin’ it on trees :P

No trees.
This was the first time out with this new gun, rings and scope, at the range, benchrest shooting.
The Burris 4-16X40 is a large heavy scope and it moved forward until it came off of the dovetail after about  50 rounds or so.
I wish I could post pics here but, it too difficult.
Title: Re: CZ 455 Scope ring base options?
Post by: painter on October 30, 2018, 08:48:41 PM
According to Burris, those screws should be tightened to 30 in/lbs.

If you have a torque wrench, or Wheeler FAT wrench type tool, I'd suggest using it.
Title: Re: CZ 455 Scope ring base options?
Post by: benscratchin on October 30, 2018, 08:54:58 PM
According to Burris, those screws should be tightened to 30 in/lbs.

If you have a torque wrench, or Wheeler FAT wrench type tool, I'd suggest using it.

The ring screws did not loosen. It's the knurled knob screws that clamp the ring bases to to receiver that allowed the whole setup to move forward on the receiver grooves. :(
Title: Re: CZ 455 Scope ring base options?
Post by: painter on October 30, 2018, 09:04:23 PM
Those are the one's that require 30 in/lbs.

There's no slot in the knurled knob for a screw driver?
Title: Re: CZ 455 Scope ring base options?
Post by: eastman on October 30, 2018, 10:47:10 PM
I put the CZ-USA Weaver/Pic rail on my 455 so that I could use the standard Warne detachable rings.
Title: Re: CZ 455 Scope ring base options?
Post by: benscratchin on October 31, 2018, 09:41:33 AM
I put the CZ-USA Weaver/Pic rail on my 455 so that I could use the standard Warne detachable rings.

^That may be the way I end up going^.

Those are the one's that require 30 in/lbs.

There's no slot in the knurled knob for a screw driver?

Okay, yeah there’s a slot in the knurled knob. I’ll put 30in.lbs.  On them and give it another try.
Title: Re: CZ 455 Scope ring base options?
Post by: benscratchin on October 31, 2018, 12:30:13 PM
I put the CZ-USA Weaver/Pic rail on my 455 so that I could use the standard Warne detachable rings.

Did you use the Diversified Innovative Products item # CZ-19008, 11mm dovetail to Picatinny rail?
Title: Re: CZ 455 Scope ring base options?
Post by: painter on October 31, 2018, 06:56:01 PM
I put the CZ-USA Weaver/Pic rail on my 455 so that I could use the standard Warne detachable rings.

^That may be the way I end up going^.

Those are the one's that require 30 in/lbs.

There's no slot in the knurled knob for a screw driver?

Okay, yeah there’s a slot in the knurled knob. I’ll put 30in.lbs.  On them and give it another try.
Let us know how it works out.
Title: Re: CZ 455 Scope ring base options?
Post by: eastman on October 31, 2018, 09:22:22 PM
I put the CZ-USA Weaver/Pic rail on my 455 so that I could use the standard Warne detachable rings.

Did you use the Diversified Innovative Products item # CZ-19008, 11mm dovetail to Picatinny rail?

I bought mine through the CZ-USA webstore - http://shop.cz-usa.com/ProductDetail/19008_Adapter-Rail-Cz-452455-11mm-Dovetail (out of stock at the moment, I did the "notify me when back in stock" to get mine)
Title: Re: CZ 455 Scope ring base options?
Post by: timetofly on November 01, 2018, 08:08:58 AM
I'm using  the Burris rings for the Rimfire/CZ grooved receiver. Maybe I need to re-clean everything and tighten the ring bases more?

I'm using these as well.  500 rounds and no indication of an issue.
Title: Re: CZ 455 Scope ring base options?
Post by: benscratchin on November 01, 2018, 08:38:50 AM
I put the CZ-USA Weaver/Pic rail on my 455 so that I could use the standard Warne detachable rings.

^That may be the way I end up going^.

Those are the one's that require 30 in/lbs.

There's no slot in the knurled knob for a screw driver?

Okay, yeah there’s a slot in the knurled knob. I’ll put 30in.lbs.  On them and give it another try.
Let us know how it works out.

Hopefully I can get to the Range this weekend.
Title: Re: CZ 455 Scope ring base options?
Post by: benscratchin on November 04, 2018, 04:21:00 PM
According to Burris, those screws should be tightened to 30 in/lbs.
If you have a torque wrench, or Wheeler FAT wrench type tool, I'd suggest using it.

I removed the scope and rings yesterday. Re-cleaned the ring base clamps and the dovetail on the receiver using Isopropyl Alcohol and cotton swabs.
Being a new gun it had a lot of brown stuff (cosmoline)? still in the dovetail grooves. I should have spent more time cleaning it the first time. After letting everything dry, I reattached the scope and ring bases to the receiver dovetail and torqued the two knurled knobs to 20in. lbs. using a standard torque wrench, then I re-torqued them to 30in. lbs.

I just got back from the range after shooting 60 rounds from the bench. I'm glad to say the scope rings are holding solid.
Being a .22 rimfire rifle with mild recoil,  I honestly thought that the scope rings would hold that scope by only hand tightening the two knurled knobs with a screwdriver. I was wrong (again).

My best 5 shot group at 50yds. today was 7/8" center to center using cheap Federal Auto-Match ammo. I'm happy with that and hope I can best that group after I purchase some CCI Standard Velocity ammo. Thanks for the input Guys!  :)
Title: Re: CZ 455 Scope ring base options?
Post by: Jiva on November 04, 2018, 05:14:37 PM
Glad you got that sorted out. My Lux loves the Auto Match as well. I had a productive session at the range on Saturday with the Varmint, CCI Standard, and a new scope.

How do you like the Burris scope?
Title: Re: CZ 455 Scope ring base options?
Post by: painter on November 04, 2018, 07:53:53 PM
According to Burris, those screws should be tightened to 30 in/lbs.
If you have a torque wrench, or Wheeler FAT wrench type tool, I'd suggest using it.

I removed the scope and rings yesterday. Re-cleaned the ring base clamps and the dovetail on the receiver using Isopropyl Alcohol and cotton swabs.
Being a new gun it had a lot of brown stuff (cosmoline)? still in the dovetail grooves. I should have spent more time cleaning it the first time. After letting everything dry, I reattached the scope and ring bases to the receiver dovetail and torqued the two knurled knobs to 20in. lbs. using a standard torque wrench, then I re-torqued them to 30in. lbs.

I just got back from the range after shooting 60 rounds from the bench. I'm glad to say the scope rings are holding solid.
Being a .22 rimfire rifle with mild recoil,  I honestly thought that the scope rings would hold that scope by only hand tightening the two knurled knobs with a screwdriver. I was wrong (again).

My best 5 shot group at 50yds. today was 7/8" center to center using cheap Federal Auto-Match ammo. I'm happy with that and hope I can best that group after I purchase some CCI Standard Velocity ammo. Thanks for the input Guys!  :)
Shows you where thinking will get you. :P

Glad you got it sorted.
Title: Re: CZ 455 Scope ring base options?
Post by: benscratchin on November 05, 2018, 06:55:13 PM
Glad you got that sorted out. My Lux loves the Auto Match as well. I had a productive session at the range on Saturday with the Varmint, CCI Standard, and a new scope.
How do you like the Burris scope?

Actually the scope is a Burris Signature 4-16x44mm with AO. Serial number 202119. I bought it new 20 years ago. I don't remember what I paid for it. It's the best scope I own.
Title: Re: CZ 455 Scope ring base options?
Post by: oldschoolhdmike on January 11, 2019, 08:41:01 PM
I figured i would add my question here rather than starting another thread.  I have a cz 455 american.  i have a scope on the way but want to go ahead and get tings tomorrow and the gun shop.  Are you guys using low, medium, or high rings?   I was going to get the rings to mount strait to the 11mm notch and not do a rail....thanks
Title: Re: CZ 455 Scope ring base options?
Post by: Phlyers13 on January 11, 2019, 09:03:31 PM
I figured i would add my question here rather than starting another thread.  I have a cz 455 american.  i have a scope on the way but want to go ahead and get tings tomorrow and the gun shop.  Are you guys using low, medium, or high rings?   I was going to get the rings to mount strait to the 11mm notch and not do a rail....thanks

I’m using highs. The problem with lows is with the bolt handle clearing the scope. Mediums may or may not work depending on the optic.
Title: Re: CZ 455 Scope ring base options?
Post by: oldschoolhdmike on January 12, 2019, 12:34:36 PM
i ordered both medium and high rings.  we will see. 
Title: Re: CZ 455 Scope ring base options?
Post by: benscratchin on February 06, 2019, 07:23:56 AM
I used the high Burris Signature dovetail  rings. The mediums were too low for my 44mm objective scope.
I had to clean/degrease the grooves on the receiver really good and properly torque the rings to prevent the whole scope/rings assembly from sliding off of the receiver grooves because of recoil.