I have used several Malkoff upgrades on older Surefires, they are top notch. Malkoff makes an excellent product, and besides the performance aspect, a Malkoff upgrade increases the value of the device IMHO. Hope this helps.
Yes an older thread, but as a fellow SL7 owner, don’t forget to check the buffer inside the receiver to prevent any serious issues. Great rifles and hope to get mine out soon! Congrats good find.
Surefire for me, and yes they are pricey. I have run them on long guns (carbines shotguns), and pistols. They do not disappoint and are very durable. I’ve gone through various generations from incandescent to led, with very good results. My work versions have held up as advertised. Hope this helps.