Front Sight Location

[mineralman55]

What are the pros and cons of mounting the front iron sights on the gas block or on the front end of a free-floating handguard. I've seen it both ways, 

[planeflyer21]

Cons of the gas block are supposedly a changing point of impact when the rifle gets hot.

 

While I know that can happen with other rifle platforms that have sights in temperature changing areas, on the ARs I mount it all on rails.

 

Jon

[Robocop1051]

I mount for whatever is the longer sight radius.

I have a set of Magpul MBUS sights mounted on the gas blocks of my .308, .300Blk and a 5.56. None of them have any signs of melting.

I have a set of Troy DiOptic sights on my 5.56 piston gas block, and they seem to be holding just fine.

My problem with mounting on a rail is that not all rails are 100% rigid. I have a Troy Alpha rail on my 7.62x39 build. The rail seems to shift just a hair when the front of it gets whacked. My Daniel Defense and Apex rails are sturdy enough to build a card house on. I guess it all comes down to how much $$$ you're willing to spend.

[Rsquared]

 I guess it all comes down to how much $$$ you're willing to spend.

Doesn't it always seem to come down to that?

[unforgiven]

^^^^^^ And that's the bottom line. <thumbsup>