FX barrle question.

[BillG]

I have a project in the works and need to know if there are any differences in the diameternof the shoulder of the brass transfer portfor the impact barrel assembly. I'm referring to the approx 1.5mm long shoulder where the bolt/ probe enter in on the .22 and .25, they are the same. At least the examples I was given. Looks like approx 10mm is the OD of the shoulder. The question is, is it different for the .30cal? Also, if anyone happens to know, what it the bolt/probe diameter of the .30cal?

Thanks for any info.

 

[nervoustrig]

The shoulder measures 0.391" (9.93mm) for all 3 calibers. It projects 1mm by the way, not 1.5mm.

The .30 cal bolt probe measures 0.301".

 

[BillG]

That's what I was needing . Thank you.
I have an old one for .22 that I had to remake for a fella. He managed to booger up the threads. This particular unit measured .053". The cut out notch, what is that for? I haven't had the good fortune to get one of these guns in my possession to scrutinize the details. I've only had opportunities to reverse engineer provided components and make alterations to those designs. I've made a few .22 and .25cal homogenous construction, using the TJ's barrels. This one happens to be a .30, which is my first for an impact. The RTI Preist II is very similar. I have done those in .30cal. Those barrels seemed to be good barrels. Consistant fit. Tight bore on a .30 projectile and good finish on the inside. The one thing that stood out with each one that I've done, is that the throat and lead in tapper were out of concentricity with the bore by as much as .004".
Thank again

 

[BillG]

The shoulder measures 0.391" (9.93mm) for all 3 calibers. It projects 1mm by the way, not 1.5mm.

The .30 cal bolt probe measures 0.301".

Would you happen to know what size oring the probe seals on?