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AR15.COM
1/12/2012 1:37:26 PM EDT
Looking to build my first. Already have an HBAR that I used for DCM matches, like the platform.
I want a shorter one, but I realized last week at the fun shop that my eyes can't focus down on the front sight with a 16" barrel. 20", GTG.

So I'm looking at a lightweight flat top build, with optics. And I'm thinking about suppressing it sometime in the next couple of years when I'm in a freer state.

So, the question is, how much change in POI am I likely to see with a pencil barrel and a can vs. an M4 profile with a can?

And I know harmonics and other things come into play, and every barrel is an entity unto itself, but I'm asking about probabilities and trends here.
1/12/2012 1:39:23 PM EDT
[#1]


First do something about your vision.

Then get a 16" pencil barrel.  You won't see any impact shift form the barrel compared to what the can brings.
1/12/2012 1:42:32 PM EDT
[#2]
Nothing wrong with that vision - there are LOTS of people in that boat when it comes to front sight focus.





As to POI shift, every can and barrel are different.  With my can, I had almost the exact same POI shift on a 12", 16", and 20" barrel.... you are gonna have to shoot it to know.
1/12/2012 1:49:22 PM EDT
[#3]
Quoted:


First do something about your vision.
Then get a 16" pencil barrel.  You won't see any impact shift form the barrel compared to what the can brings.


Yeah, thanks. I turn 54 in a couple of months, and they're just not what they used to be.

Ok, that actually was helpful, and what I suspected.