The mags will work just fine. I do not believe the light will, as the original M's rail is 2 unconnected slots and I believe the TLR2 requires a solid slot (if that makes any sense). If you sold the M and ordered the MA1 from CDNN, the "upgrade" shouldn't cost much at all.
Steyr obviously had some idea for their own proprietary system that never worked out. At least they realized the mistake and remedied it with the A1 series - H&K is only now realizing the proprietary setup can be a deal-breaker with the civilian market.
I'm not surprised to hear the adapter for the Ms leaves a lot to be desired - I have an adapter for my USPc and the bottom of my M6X hangs almost as low as the floor plate of the magazine :shock:.
Ya, the LAM is absolutely insane $$$$$$. But then the hardcore H&K guys tend to not care about little things like money... :evil: :lol:
In fairness, most people put the LAM on the SOCOM, so you're only spending half as much on the light as you did on the pistol. Come to think of it, my M6X was only $100 shy of my M9A1, so I should probably shut my mouth. I guess if you want it bad enough, price isn't as much of an issue.