Odd BBLs From Numrich

[Olle]

Originally Posted by sheepherder

Kind of a strange way to make a replacement barrel... If you're going to the trouble of turning the taper and the shoulder, and chambering it, but not machine the front sight base, why not thread it???

Maybe they are rejects. QC caught them right before they were threaded, and they were sold as metal scrap to Numrich. I get that feeling sometimes when I order from Numrich.

[sheepherder]

Originally Posted by Olle

Maybe they are rejects. QC caught them right before they were threaded, and they were sold as metal scrap to Numrich. I get that feeling sometimes when I order from Numrich.

If so, why turn the front sight band round??? Just scrap 'em...

There's no note about "More than one available"...Maybe a CNC test of each length that the coder forgot the sight band base???

I have bought 'scrap' from Numrich. S&W had a run of SS 659 slides that had been finished machined, but the roll-stamping was off, so S&W sheared them in half and Numrich sold the halves. I bought several and made long-slide [5" bbl] 659's out of them.

[sheepherder]

Well, the auctions are over. The 6 1/4" barrel was bought by "someone" [coff, coff] for $42; the 8" went for $31.

I'd say these prices are very good, as it would cost me in time more to machine these to this level of completion than my last employer paid me...IOW, more than two hours...

[Olle]

Originally Posted by sheepherder

Well, the auctions are over. The 6 1/4" barrel was bought by "someone" [coff, coff] for $42; the 8" went for $31.

I'd say these prices are very good, as it would cost me in time more to machine these to this level of completion than my last employer paid me...IOW, more than two hours...

I knew you wouldn't be able to resist.

[sheepherder]

I git the 6 1/4" barrel in from Numrich today...I'm somewhat disappointed...

It may not be readily apparent, but the taper is quite 'fat' up where the shoulder is...More so than a 9mm or 7.65mm [100mm/98mm] barrel [first pic comparing 98mm/7.65 barrel to Numrich]...

The Numrich barrel measures .710" at a point 5/16" forward of the receiver flange surface...The Luger 7.65 barrel measues .620" at the same point...

I tapered a home-made 9mm barrel using 7.65 dimension at the barrel band and the point 5/16" from the receiver flange surface (IOW, a stretched 7.65mm taper)...That's it [second pic] compared to the Numrich barrel...

While my homemade tapered & stretched barrel is no show winner, IMHO the profile is much more esthetic than the Numrich barrel...

I don't see why the Numrich barrel was made so 'fat' at the rear...

The 7.65 Numrich chamber is 'sloppier' than my Clymer-reamed barrels...Lot more 'wiggle'...Thread stub is right-on in length and diameter...Bore looks OK...

Flange/shoulder is artillery thickness; not 98/100mm thickness...Numrich front sight band diameter is .008" greater; flange dia is .020" greater; end of taper in front is .018" less...

The dimensions on the Numrich barrel don't equate to anything I have here...In 7.65 or 9mm...Even the 6 1/4" OAL length is odd...

I suspect I'll probably end up re-tapering it...So that it has a 'stretched 7.65 barrel' taper, like my barrel in 2nd pic...

Another Numrich mystery...

[Olle]

Another Numrich mystery for sure...

Whatever it is, I guess it's still better than starting with a blank. The chamber is a bummer though. Is there enough meat on the flange to cut back, so you can deepen the chamber?

[sheepherder]

Originally Posted by Olle

Whatever it is, I guess it's still better than starting with a blank.

It was cheap enough to be worth a shot. It beats having to cut away all that steel to get down to the profile I want. It'll just be 5 or 6 taper cuts now.

The chamber is a bummer though. Is there enough meat on the flange to cut back, so you can deepen the chamber?

I won't bother. It may well be within tolerances, especially for military use. Clymer reamers are typically .002" over SAAMI case dimensions. That's way under specs for military. I don't really have any way to measure this chamber directly. No matter. I won't be shooting hot loads.