X300U is a great starting point, alternatively just about any 2014 or later LED emitter is going to be stout enough. I prefer tighter beams (Scout variety mostly) which negates the need for mega output (tight hotspot on a 200lumen light will still be visible through a 500lumen spread out beam), and for rifles I tend to like a condensed beam. Pistols I like the wider beam, same with EDC type lights, but on a rifle with a tighter beam the 'minimum' I'd consider is a whopping 120 lumens - it seriously is adequate in a tight beam for stuff in low light where you're not trying to blind people at distance when the sun is still partially visible on the horizon.
عندما تصبح الأسلحة محظورة, قد يملكون حظرون عندهم فقط
کله چی سلاح منع شوی دی، یوازي غلوونکۍ یی به درلود
Semper Fi
"Being able to do the basics, on demand, takes practice. " - Sinister
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