Is there any way this could be pinned/welded?

**jthrelf** · April 9th, 2020, 04:12 PM

I ordered a 14.5" upper from CDNN that is supposed to be pinned and welded. There are some guys talking over on ARf that their pin/weld jobs may not be cutting it (on pg 14):
https://www.ar15.com/forums/AR-15/Re...47092/?page=14

The only potential spot I see on mine is that small area of discoloration, and the crush washer is sanded flat in that spot, where you would assume the weld spot was sanded also. CDNN claims it is indeed pinned/welded and they all have the cleanest work they've ever seen. Btw this is on the left side of the barrel, not the bottom like you typically see.

What do you think? Send it back and don't take the chance? (Getting the work performed myself is cost prohibitive for the value of this upper).

**raxar** · April 9th, 2020, 04:34 PM

If you're really worried about it try a wrench.

**Mr_Gixxer** · April 9th, 2020, 04:40 PM

Worst case scenario if it's not pinned and welded it's almost the maximum allowed barrel length allowed for a pistol loaded in a vehicle in PA. Slap it on a pistol lower and get decent muzzle velocity, range and accuracy in a gun that you can pretty much leave loaded everywhere.

**Delkal** · April 9th, 2020, 04:52 PM

Who knew if you did a professional job it would be a bad thing? I am sure it is like they say but if you are worried take a stick welder and bugger the flashhider up. And make sure you get splatter all over the barrel too.

Not that I am implying that anyone should break any firearms laws.........But does anyone know of a case where it took a forensic BATF armorer to get a conviction (besides full auto of course)?

**Royinmontco** · April 9th, 2020, 05:16 PM

Originally Posted by Delkal

But does anyone know of a case where it took a forensic BATF armorer to get a conviction (besides full auto of course)?

problem is that if it's not pinned and welded, all it will take is a vice block and a wrench.

**Delkal** · April 9th, 2020, 05:19 PM

Originally Posted by Royinmontco

problem is that if it's not pinned and welded, all it will take is a vice block and a wrench.

Was there a conviction?

**abner13** · April 9th, 2020, 04:59 PM

Do you want to remove the FH , or do you just want to know for sure it is P&W?

A shop I frequented got a great deal on some NOS USGI M4 barrels years ago. I drilled a 1/8 hole thru the FH at 6 o'clock and into the barrel about .05-.06 , inserted a hardened 1/8 dowel pin , and ever so carefully TIG'd it in place. I basically just melted the end of the pin , and purposely left the evidence in place.