Michael, "Standard SAAMI" pressure 9mm will shoot just fine in the older Star. The rounds to avoid are the 9mm loads marked +P, +P+. This is an all steel pistol and won't explode with firing an occasional hot round but don't fire a steady diet of them. http://averagejoeshandgunreviews.blogspot.com/2014/02/star-bm-9mm.html

Hi Michael, Use the blazer brass not the NATO.

Avoid the NATO spec ammo, NATO spec. means military standard ammo. This ammunition is frequently loaded to higher pressure than civilian ammo.
The ammo industry uses something called SAAMI Standards to establish the pressures that ammo should be loaded to. The SAAMI pressure for 9mm Luger ammo is around 35,000 PSI, and C.I.P (think European SAAMI) rates 9mm Luger ammo at 34,080 PSI. According to documentation, the 9mm NATO rounds are pressured at 36,500 PSI (again according to CIP). That means that when compared to standard 9mm ammo, the 9mm NATO ammo is running a higher pressure, analogous to a 9mm +P load, which SAAMI rates around 36,000 PSI. gunnuts.net/2009/04/03/9mm-nato-vs-9mm-luger/

With the older Star 9mm I would stay away from the "NATO" marked 9mm ammo for 124 grain I recommend this budsgunshop.com/catalog/product_info.php/cPath/656_2081_10000837/products_id/712015085/BLAZER%20BRASS%209MM%20124GR%20FMJ%2050/20/