I don't think there is any question that MagSafe loads its ammo over SAAMI pressure specs. I have read accounts (accompanied by pictures) on two occasions of Kel-Tec P-3ATs that were blown up using MagSafe. MagSafe now puts stickers on its packaging stating it is not for use in Kel-Tecs, but neither of the accounts I read about had the sticker on the ammo. No surprise they are less than forthcoming with callers considering their liability is sticking out about one mile...Kel-Tec has started telling customers not to buy it, mostly for their own safety. They have cheerfully rebuilt both the damaged guns I read of at no cost to the customers.
If I had spent $1000 for an R9, it would be the
last thing I resorted to putting in it. The whole idea of having a pocket pistol chambered for a full power combat cartridge is not having to compromise on either the penetration or expansion side of the equation. IMO, prefragmented junk like MagSafe or Glaser is pointed squarely at people who think that $3/round will somehow buy them extra performance, when every credible expert I have read seems to think it is inferior to even the cheapest FMJ practice ammo. It is a dangerous scam in three ways: damage to your pistol and/or damage to your person if the pressure blows up your gun, and its inability to effectively end a gunfight getting you injured or killed by an assailant.
No offense meant to anyone here, but as you can see I feel pretty strongly about fragmenting handgun ammo in general and MagSafe in particular. Do yourself a favor and at least research this stuff on the web extensively before you trust your life and Rohrbaugh to it.