Well, I've never seen an aluminum stock, but do believe there were some made for Portuguese field use. I do not believe they were "factory" as in made by AI, but as HHollow has surmised, may well have been produced under contract. I can't be certain that yours is one from the early 60's, but the holes for the sling bracket appear to be in the right place––something that an 80's kit builder probably wouldn't have done. I'd guess the finish was applied later, however.

Frankly, I don't have much info on the aluminum furniture, but was just in touch with a guy a few weeks ago who owned an original rifle "in another country", and also had a couple semi-autos when the kits first came to North America. He told me that Peter Wilke once gave him a gift: "...a cast aluminum butt stock. Made for tropical service. It was painted the same pukey brown as the phenolic one, and had the same sling attachment. What was most unusual, was the fact it had all types of scribbling all over it, with patriotic slogans such as Liberti Angola Etc. Patria Viva. It fit like a glove and I would use it a service matches, because I was afraid of breaking the original butt stock."

Unfortunately, the gentleman no longer has that stock (and hasn't yet come up with any old photos of it), so that's the best info I've got: At least some of the aluminum stocks were painted the same brown as the synthetic stocks, and they used the same sling attachment.

It would be interesting to know what that textured finish is covering!

ETA: What's the inside diameter of the hole for the buffer tube?

Definitely made by or for the Portuguese military. Normally would be painted brown. The regular buttpad/buttplate does not fit. Rather this stock takes an all-aluminumm buttpiece that is painted black to look like the original rubber piece.

Here are two more PG's. The checking is very consistent. Could this have been done by hand?


The innards of the buttstock should look like this:

i'll get some pics of the insides. they look a little different, it doesn't have the reinforcement ribs like your pic.

yeah the checkering on the handguards look a little too close to each other to be freehanded, especially since some are smaller than others, unless it was a pattern that was traced and then hand finished.