Ross MkII Nostar Barrel/Rcvr Assy

[bushwhacker]

I took my MkII no star apart to glue & clamp cracks in the stock. While I was at it I decided to remove 100 years of crud and free up the fine adjustment on the rear sight. In the process of doing this, I noticed looseness between barrel and receiver. Having read how theseMkII threads were tighter than the hubs of Hell, I was intrigued. Found that when the setscrew that is pictured protruding is removed, the barrel unscrews quite easily. It is a LH Buttress thread. You can see the square thread shoulder on one side and the 45 degree shoulder on the other side. The larger setscrew shown in the bottom view is ground on an angle on the back side and straight across, looks like it was contacting the barrel sholder on the front. You can see it between the bolt lug and body in the end view of receiver. I think the bevelled side must have to do with guiding cartridge into chamber. The small setscrew tightens up against the square shoulder of the section cut out of the thread in the third picture. Perhaps this method of assembling Barrel/Receiver was only used on early MkII's. Couldn't have contributed a lot to accuracy or headspacing if the setscrew got loose.
Bill

 

[tiriaq]

The intent was to make barrels easy to change without sophisticated tools. All Mk. II/1905 rifles breech like that, except for II**.

 

[cantom]

Thanks for the pics Bushwhacker. I've heard of this but never actually seen one apart. Not much in the way of threads holding these two parts together is there? One turn...it was actually loose?

And yes, that does show as LH thread. That's why Rossguy said he's seen so many Rosses with gouges on the barrels- people tried threading them out RH...understandably. Little did they know they could thread them out the other way with their hand!

 

[bushwhacker]

MkII except **? So the Rifles that were designated MkII3* and MkII5*, would use which system. The re-designation of the MKII's is confusing. Maybe when I get the Ross Rifle Story it will be explained better. I am working from the "Sir Charles Ross & his Rifle" booklet.

 

[cantom]

MkII except **? So the Rifles that were designated MkII3* and MkII5*, would use which system. The re-designation of the MKII's is confusing. Maybe when I get the Ross Rifle Story it will be explained better. I am working from the "Sir Charles Ross & his Rifle" booklet.

Yes, I have the same book as you. I believe every mark of Mk II used the thread system you show, except for the Mk II**, which has the bigger thread and is torqued in very strongly. Does it make sense that the 3 star and 5 star would have used the smaller barrel? Not to me but the whole Ross story is quite a mind boggler.

My Ross 1905-E also uses the bigger barrel thread barrel. One way to tell is to look at the bottom of the trigger guard. If there are three screws (one retaining the two bigger ones) it's the big thread barrel, found on II** and 1905-E.

 

[mattimoose]

Yeah, it's a goofy thread. I was gonna cut-one, but found 2 excellent take-offs.