Originally Posted By Joel89:
I was looking at a mk16 again, but that's mildly concerning.
For the time being, no Aiming device would be mounted on the end, so a little flex wouldn't be an issue. But who knows what the future may bring.
Thanks for the reply.
It is plenty rigid enough for an aiming device on the end.
Without giving a whole class on physics, material science, trig etc. I can report that the MK16 rail works great for a setup with a laser on the end. It doesn't have enough flex to matter for anything you would use a laser for, and as long as the weight of the front of the gun is resting back close to the receiver (like it will both shooting off a bag or off hand), it won't flex at all. You would have to use a laser that weighs dozens of pounds to create the same POI shift I observe using a bipod mounted out on the end of a 15" MK16 rail. FWIW even with a bipod, it is consistent enough that you can just note the difference in your zero, and it will return when going back and forth. I just prefer to not have to worry about this since a bipod is rarely the right answer for anything I use my ARs for.