AR-15 gas block

[CQB Elite]

I'm putting a lo-pro gas block on my AR and was wondering what is the best way to make sure the gas block lines up with the port in the barrel.

[sigrug17]

Plenty of good vids on YouTube...

I usually install (dry-fit/ test fit ) the gas tube to the gas block 1st, put the barrel on the upper receiver and then put the gas block & tube on the barrel.... [b]get it all lined up [/b]place thin accurate marks on the gas block and barrel as alignment marks and then go from there.

[JeffsSig]

If you have air you can blow air into the barrel end (with flash hider removed) with the other end blocked (Plugged) Then slowly move the gas block around until the best air flow coming out of the gas tube is felt .

[Guest nysos]

I put a mark with a pencil or a market on the gas block where the hole is lined up, and put a mark on the barrel as well. That way You just line up the marks on your gas block/barrel.

[Lumber_Jack]

[quote name='nysos' timestamp='1353429358' post='848762']I put a mark with a pencil or a market on the gas block where the hole is lined up, and put a mark on the barrel as well. That way You just line up the marks on your gas block/barrel.[/quote]

This, make sure you pencil lines are straight and perpendicular to the respective holes and then you should be good to go.

[CQB Elite]

Thanks for the replies!

[Guest twpayne75]

Let me attack this from a different angle.

Why are you going to a low profile gas block?

Is it because you are going to use a free float rail?

[CQB Elite]

[quote name='twpayne75' timestamp='1353896333' post='850649']
Let me attack this from a different angle.

Why are you going to a low profile gas block?

Is it because you are going to use a free float rail?
[/quote]

Yep

[Guest twpayne75]

Just trying to save you some time and money through experience. I have used Samson, Troy, and Midwest Industries and never took off the factory front sight base. You can cut them down and still use them without ever taking it off the barrel. I can do one now in less than five minutes with a Dremel or Roto-Zip. The outcome looks professional, which really doesn't matter since you can't see it anyway.

Here is a picture of one of mine. There is a factory FSB under the rail. It has tons of clearance. If interested let me know and I will find a link to the tutorial.
[IMG]http://i35.photobucket.com/albums/d155/twpayne75/STAGCOMP016.jpg[/IMG]

[Guest J.boyette]

The best way?

Here you go.

http://www.brownells.com/gunsmith-tools-supplies/rifle-tools/gas-system-tools/ar-15-m16-gas-block-dimpling-jig-prod42283.aspx?avs|Make_3=AR-15/M4#.ULLzloZWrU0

With one of the low pro gas blocks with set screws at the 6 o'clock postion.

John

[CQB Elite]

Thanks for the replies. I bought a barrel and a DD Lite rail 10.0 for my build but have decided to go a different route (my original plan). I bought a FSB and I'm sending it and the barrel to ADCO to have it drilled for taper pins. Edited November 30, 2012 by EB-SF