Newbie...with a couple of thoughts on Primary Arms
I got a Primary M4 Clone based on their reviews and links on AR15.com.
I have NO experience with their flashlight, only the M4 Clone.
I got it to see how it might work as a cheap red dot (vs. $400+ Aimpoint or EoTech).
I have had a couple of EoTechs in the past and used an Aimpoint once (not mine, just had a chance to shoot it a bit). I also have a Hakko Blue Ring red dot...one of the better Aimpoint type red dot sights (as a reasonable quality budget red dot scope).
I compared the Primary Arms to the Hakko (the Primary is actually built better with glued-in electronics, a heavier body, clicks at each brightness setting, etc). Not up to Aimpont quality, but at 1/4 the cost (and it comes with a mount) it is a very durable budget red dot for casual shooters. Considering that someone took a Hakko and (intentionally) abused the hell out of it (dropped it, threw it, hit it, left it outside in the cold, etc.) and it worked fine...I'd expect the P.A. red dot to do very well also.
Just for fun, I put a Lithium AA battery in the scope. Primary reports 400 hours run time.....So, I set the brightness setting on #2--bright enough to see it in a well-lit room, and set it for the "EoTech" big circle around a dot.
I did that on August 17. As of today...it's still running (49 DAYS later...1100 Hours).
The vendor (Marsh1 on AR15.com) doesn't present the scope as an Aimpoint (or Eotech) replacement....just as a quality budget scope. The same for his weapon light. I'm considering getting one as a trial (so I can see if I like the click switch or tape switch, and various mounting positions--considering that you get the light, both switches and the mount for $100, it's a good way to figure out what you want).
If I was going in "harms way" as a Police Officer or Soldier, I'd get the best possible $500+ Weapon Light...however, as a casual user, the Primary makes a good trial light.
Just a few thoughts on the manufacturer/vendor (If I get the Primary light in the near future, I'll post some kind of a review).