If you're talking about the Itajuba converted rifles on the 98 Mauser action, convrted to 7.62x51, they never were imported in large numbers.
To tell the truth, they weren't overly popular.
The reason they weren't popular, is because they were ugly.
They took full length 98 style rifles of all types that they had and installed new barrels.
The barrels were originally chambered in 30-06 and were shortened by turning off about an inch of the chamber and rechambering them to 7.63x51. Then, they shortened the muzzle end as well and added a high front sight and bulky muzzle brake/flash hider.
The stocks were cut down and had a bulky, unfitted, rubber recoil pad added, then the whole thing was covered in a heavy coat of some brown lacquer or resinous material.
They were fitted with an H&K drum type rear sight as well as an H&K bayonet attachment.
They were the same length as the H&K G93 rifles. I suspect they were to familiarize their troops with the sight picture before transitioning to the G93.
Many people, bought them because they were cheap. Around $30 each.
I know a few guys that stripped them down completely to refinish into sporters.
You could get about $20 for the H&K rear sight at the time so it turned into a pretty cheap action that that was quite well made, of superior steels.
I have a complete unbubbaed rifle and one that was stripped of the rear sight.
They shoot OK. Not tack drivers by any means and the reason for the brake is obvious after the first shot.
Everyone of them I've seen, have excellent bores.
When you take off the top handguard, it's a bit frightening to see how much of the chamber end they cut off the barrel.
I've never heard of one giving any trouble of any sort, other than the complaints of severe recoil.