Barrel extension

[oldyeller]

Is spot welding a barrel extension on considered permanent? For achieving 16 inches.

[Bob Hostetter]

The barrel extension is not included in determining the length of a rifle barrel so the extension doesn't need to be permanently attached.

The length is determined by measuring from the bolt face in the closed position to the muzzle .

[kalibeltfeeder]

The barrel extension is not included in determining the length of a rifle barrel so the extension doesn't need to be permanently attached.

The length is determined by measuring from the bolt face in the closed position to the muzzle .

That sounds wrong..
So my AMD with a 14" barrel and the welded on muzzle break s still a 14"er?

Op, if your using the break/ fake can to get to 16" it needs to be permanently attached,

[AGFNTB]

Is spot welding a barrel extension on considered permanent? For achieving 16 inches.

I've been doing some reading on this. What I found, from ATF LINK, page 6, is this:

[ar15barrels]

There is no method of "spot welding" which would apply to permanent attaching of muzzle devices.
Spot welding is done by pinching two pieces of sheetmetal between contacts and then applying a bunch of current through a set of contacts that causes the metal being welded to heat up so much that they fuse together.

[Cokebottle]

That sounds wrong..
So my AMD with a 14" barrel and the welded on muzzle break s still a 14"er?

Op, if your using the break/ fake can to get to 16" it needs to be permanently attached,

Maybe a little clarification of terms as there seems to be some confusion.

The barrel extension is the collar at the breach end of the barrel that consists of the feedramps and locking lugs.

It looks like the term "barrel extension" is being used to refer to a "muzzle device"


As Randall indicated, you can not "spot" or "tack" weld the muzzle device. It must be drilled, blind-pinned, and the pin welded over.

[Glockrocks]

OP another option would be to pin and weld the barrel extension (fake can) so your OAL from bolt face to end of extension is over 16 inches.

[oldyeller]

Correct, I meant muzzle device and tack weld. Needed to an 1/2 inch to a VZ58 barrel.

How about a bead weld all the way around?

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[jericho89]

How about a bead weld all the way around?

[oldyeller]

So fusing with a tack in one spot should do it then?

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[oldyeller]

As Randall indicated, you can not "spot" or "tack" weld the muzzle device. It must be drilled, blind-pinned, and the pin welded over.

I don't see where he actually indicated that

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[Cokebottle]

So fusing with a tack in one spot should do it then?

No.

It would require a full seam weld (if you really don't like your barrel).

The closest thing to a "spot weld" would be the blind pin, which has a small rosette weld on the end of the pin.

As Randall said, that is not a "spot weld"
A "spot weld" is how the rails are attached to an AK receiver.


Based on your questions and use of improper terminology, I would hazard a guess that you do not possess the proper welding equipment or skills to perform this work without damaging your barrel.

I don't see where he actually indicated that

He said that it is not a spot weld.

[oldyeller]

No, I do

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[oldyeller]

So coke bottle, what your saying is the only way is to drill, pin and blind weld? No other way to permanently attached?

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[ar15barrels]

As Randall indicated, you can not "spot" or "tack" weld the muzzle device. It must be drilled, blind-pinned, and the pin welded over.

Other acceptable methods of permanent attachment of a muzzle device include a single bead between barrel and muzzle device that goes more than 180 degrees around the barrel, 4 beads equally spaced around the circumference or silver solder that exceeds 1100 degree melt temperature.
All of those are MUCH more destructive/intrusive than a blind pin with weld over the end of the pin.