Hello! I'm a Norwegian Redneck who purchased 2 lower receivers last year.
Project #1 was assembled right away, but #2 was not.
Attachment 33438Attachment 33438
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Hello! I'm a Norwegian Redneck who purchased 2 lower receivers last year.
Project #1 was assembled right away, but #2 was not.
Attachment 33438Attachment 33438
The crack goes all the way trough the receiver, the anodizing fills the crack.
So this happened early in the process.
Was thinking to make a dedicated .22 of it, but will it hold up .223 if properly welded?
A guy i know is like Master Yoda when it comes to welding.
Any input is highly appreceiated
Aluminum lowers are made from either the 6061 alloy or the 7075 alloy. 7075 is not weldable, and 6061 will have to be re-heat-treated after welding. This heat treating is not just quench-and-temper, but an involved precipitation hardening process.
Your crack is at a critical stress point. It looks to me like you should scrap the receiver.
thank you for your opinions, in Norway, the lower is the registered part.
according to website, it's 7075 T-6.
so, scrapping is an option. but i think maybe i can use it as a dedicated .22 trainer.
it's all up to master Yoda then.
when the lower cross the atlantic, it turns to silver.
after crossing the Norwegian border, it turns to gold...
i paid approx. $240 each, +approx. $70 tax (equalent to your tax stamp)
but got a full refund for the cracked part.
so, welding seems like an option -IF possible.
You are wasting time attempting to weld it. It couldn't be cracked in a worse place. There is no where to leave any added material. The front, back and top would have to be dressed back to spec and threads chased if he breaks through. Even if he gets the 7075 stuck back together it is most likely going to crack again. Throw it away.
You can build 22 rimfire out of it, but realize it will eventually get worse and finally fail. It may be possible to have a clamp machined to go around that part that will hold it together after the receiver extension is installed.
For your 5.56 rifle, get another receiver. I don't suppose you can get your money back on the cracked one...?
Thank you Sir.
Will scrap it and obtain a new receiver.
The source is dry, so i need to find a new supplier.