Quarter rib recommendations

[SkullKeeper]

I’m looking for recommendations for gunsmiths that do quarter ribs. I’ve seen a few designs I like but would also like to see more options of ribs and elongated rear sight bases some members have had done. Thank you in advance for the information and photos.

 

[Jefferry404]

contact Tm at Matrix Gunsmithing. He is offering custom quarter rib kits (qrib, banded sling swivel, banded front sight base) machined to any barrel contour.
This just came of the press, unpolished, for my 375HH Model 70.
Steve

 

[uplander01]

MNR Custom. The rib pictured above is done absolutely correctly. I've never understood why the very rear of the qtr rib right in front of the action would be raised and square, giving a nice abrupt edge for your hand to deal with when carrying single handed. hats off to that kit and the guy doing it right.

 

[Wishfulthinker580]

Should the rear of a proper quarter rib not be perfectly level it’s entire length and flush with the square bridge offering a seamless flow between the two?

If it’s not level the entire length it sort of defeats the purpose of a quarter rib does it not? May as well not even bother with one in that case.

 

[Jefferry404]

you are correct, Sir. I must say, as a retired engineer with time on my hands, I designed the aforementioned quarter. The top base is set to be the same height as either a square bridge or a scope base from the action centerline and yes, not much of a sight plane but it still aids in sight acquisition.
I use a term, "goldline" which the amount of visible gold fill from the bottom of the filed V to the square bridge and try to keep this around 150/1000 for good pickup and this is a determining factor.
But in this day and ag, I have to consider scopes. The step down from the top of the base is to provide clearance for a scope with 42mm objective. If the top base was extended back for a better sight plane, would need a smaller objective or taller scope bases (then the stock design for sighting both irons and scope needs more consideration. I use Talley medium scope bases when a round action.
To uplander01 point. The section mating to the action front ring has the same radius of curvature as the action, just set below, 50/1000 or so. This give a nice interface.
Anyhow, I appreciate the comments.
Steve

 

[SkullKeeper]

Should the rear of a proper quarter rib not be perfectly level it’s entire length and flush with the square bridge offering a seamless flow between the two?

If it’s not level the entire length it sort of defeats the purpose of a quarter rib does it not? May as well not even bother with one in that case.

I completely understand your point and to me there are quarter ribs for doubles (which your above observation would hold true 100% with me) and slightly different ones for magazine rifles with scope options, but that’s just my preference.

 

[Jefferry404]

this is on a Johannsen action setup for 416 Rigby. I do not know... but if one wants one, can do.
Steve

 

[SkullKeeper]

this is on a Johannsen action setup for 416 Rigby. I do not know... but if one wants one, can do.
SteveView attachment 654921

The rib on my Dumoulin is like this. It has claw mounts - front claw base is incorporated in the rear of the rib.

 

[KJE81]

My, still not finished, custom rifle has a similar design on the quarter rib as the Johanssen example above. I think they do it like that so the scope can have larger oobjective bell without getting in conflict with the open sights.

 

[HunterX]

My, still not finished, custom rifle has a similar design on the quarter rib as the Johanssen example above. I think they do it like that so the scope can have larger oobjective bell without getting in conflict with the open sights.

View attachment 654930

Beautiful design! Love the engraving!

 

[Jefferry404]

if I limit the scope to a 24mm objective for a DGR and wanted more sight plane, in this case 2 1/2", I would mate it to the action as such.

 

[Jefferry404]

FYI, If anyone is at the DSC in Atlanta, this kit is there. Contoured for a Douglas#5 barrel. Tim got carried away with the presentation box
Steve

 

[SkullKeeper]

FYI, If anyone is at the DSC in Atlanta, this kit is there. Contoured for a Douglas#5 barrel. Tim got carried away with the presentation box
Steve
View attachment 656803

Thank you, I’ll look for him there

 

[Jefferry404]

Look for Matthew Roberts booth as this was made for him.

 

[farmer_john]

My, still not finished, custom rifle has a similar design on the quarter rib as the Johanssen example above. I think they do it like that so the scope can have larger oobjective bell without getting in conflict with the open sights.

View attachment 654930

Who made that one?

 

[KJE81]

Who made that one?

I ordered it from a german engraver named Manfred Fleischer who did all of the engraving, unfortunately I did not got any information about who did the gunsmith work.

The end result turned out great I think.

 

[txtrout75218]

That came out really nice.

 

[WCFMetalsmith]

When Douglas barrels replaced the old Tracer Lathe with a new CNC lathe a year or so ago. That caused a slight change in the breech contour. So many of the off the shelf 1/4 ribs no longer match up with the new barrel contour.
That is why I always make a fiberglass impression of each customers barrel and then profile the 1/4 rib to match the barrel contour.

WCF

 

[farmer_john]

When Douglas barrels replaced the old Tracer Lathe with a new CNC lathe a year or so ago. That caused a slight change in the breech contour. So many of the off the shelf 1/4 ribs no longer match up with the new barrel contour.
That is why I always make a fiberglass impression of each customers barrel and then profile the 1/4 rib to match the barrel contour.

WCF

Do ou make and insall them or just make? And do you have a website

 

[Accidental Villain]

you are correct, Sir. I must say, as a retired engineer with time on my hands, I designed the aforementioned quarter. The top base is set to be the same height as either a square bridge or a scope base from the action centerline and yes, not much of a sight plane but it still aids in sight acquisition.
I use a term, "goldline" which the amount of visible gold fill from the bottom of the filed V to the square bridge and try to keep this around 150/1000 for good pickup and this is a determining factor.
But in this day and ag, I have to consider scopes. The step down from the top of the base is to provide clearance for a scope with 42mm objective. If the top base was extended back for a better sight plane, would need a smaller objective or taller scope bases (then the stock design for sighting both irons and scope needs more consideration. I use Talley medium scope bases when a round action.
To uplander01 point. The section mating to the action front ring has the same radius of curvature as the action, just set below, 50/1000 or so. This give a nice interface.
Anyhow, I appreciate the comments.
Steve

I’ve wondered about the down step on occational 1/4 fitted rifles. Now I know and it makes perfect sense. Very good. Here are couple of my go to rifles with different variations.