Two more INCH build questions please? >>

[Tomovich]

1) If my breaching washer is too thick by say .010" can't I just pop the barrel in my lathe and set back the barrel shoulder .010" to match???

2) Can the ol' Tapco gas piston we all know and "love" be used in these Brits as nicely as they've worked in the Imbels??

Thanks guys!

[Pluribus]

1) If my breaching washer is too thick by say .010" can't I just pop the barrel in my lathe and set back the barrel shoulder .010" to match???



You could do that or, surface grind or mill .010" off of the breeching washer. I've taken .007" off by hand on a fine india stone by a determined number of stroke's (say 10) and rotating 90* for 10 more and, so on until I've gone 360* then, measure. Begin again if needed.

Edited to add: You can also buy another of the correct size.


2) Can the ol' Tapco gas piston we all know and "love" be used in these Brits as nicely as they've worked in the Imbels??




Yes, you sure can.

[W.E.G.]

Originally posted by Tomovich
If my breaching washer is too thick by say .010" can't I just pop the barrel in my lathe and set back the barrel shoulder .010" to match???

Yes. But why wouldn't you just thin the washer rather than bugger the barrel?
Sandpaper my good man!

Originally posted by Tomovich
Can the ol' Tapco gas piston we all know and "love" be used in these Brits as nicely as they've worked in the Imbels??

Yes. Any "inch" or "metric" or "aftermarket" piston can be used in an inch gun.

[Tomovich]

As far as the gas piston goes.....thanks.........cool!

Now as to the barrel. For the $10 to buy a washer I figured I could just throw it in the lathe and use about 3 ~ 5 cents of electricity. Jeez..........is that really buggering the barrel? I thought you guys strictly adhered to the Wiley Coyote School of Gunsmithing fer ChrisesakE?!?!?!?! I mean hell, it's normal fare for a Metric barrel...........why not an INCH?

For that matter, who the hell, and for WHAT, did they invent a breaching washer for anyway??

[Arby]

Originally posted by Tomovich
As far as the gas piston goes.....thanks.........cool!

Now as to the barrel. For the $10 to buy a washer I figured I could just throw it in the lathe and use about 3 ~ 5 cents of electricity. Jeez..........is that really buggering the barrel?

The general rule of thumb is to cut on the cheapest part, which in this case is the breeching washer. Really nice imported barrels are getting pricey these days.

The washer works very well, in that you don't have to work on either the barrel or receiver to get it to time right and with the proper amount of torque. But it helps to have a good assortment of washers on hand (which, I imagine, few of us hobbyists do).

[Prototype Services]

Privet Tom,
Get 12" of tubing, use your lathe and parting tool to make your own, as needed.
(Baltika 9)
Poka,
Dave

[karambay]

I ran into a similar issue when I over estimated breeching washer size. I figured I'd work on the cheaper part and try to sandpaper the breeching washer.
However, I found it MUCH EASIER to trim the barrel in the same manner that I've done for any undertimed metric build. I found I could remove the appropriate amount of material faster and more evenly with the file/barrel shaver method.
So my 2 cents is to trim the barrel.

[Tomovich]

Privet Dave............Kak Zhizn?

That's not a bad idea! I like the tube thing. But since I *AM* getting some agreement here for the barrel I am REALLY liking the barrel shoulder idea!

Ya lenivy moi druziya. (I'm lazy)........

[tac-40]

I thought you guys strictly adhered to the Wiley Coyote School of Gunsmithing fer ChrisesakE?!?!?!?!

WECSOG is working on the cheapest or least critical part first to make any modifications. That way if you screw up, the entire project won't be scrapped. Since you have a lathe available, lets see; 15 minutes of your time plus $0.20 in materials, or 15 minutes of your time and a $100 and up barrel.

If you modify this barrel for that receiver, you may not be able to use it on another receiver because the clearances are too great. If you end up selling the barrel, somebody else might get that headache.

[Tomovich]

Point made. Nothing like pure logic................

[Prototype Services]

Tom,
I ran into this last week, working on my shorty para.
I could cut the barrel shoulder, thin one of the breeching washers I have on hand, cut a new one from some chromoly rollcage tubing I have, or cut back the receiver. All would accomplish the same thing.
But:
(1)-The receiver is expensive, and I may choose to rebarrel someday.
(2)-The barrels are now getting expensive and harder to find. Ditto on rebarrel.
(3)-The breeching washer is cheap, easy to copy or replace from common materials.
Being I have to drive 20 miles to borrow use of a lathe for the shoulder or tubing, I modified my breeching washer.
I have a bunch more inch builds to do too.
But I DO need to make some more breeching washers. Of the 12 kits, I have 4 washers. :-(
Poka,
Dave