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AR15 Handguard compatibility

Posted on 10/28/20 at 2:54 pm
Posted by jlovel7
Louisiana
Member since Aug 2014
21329 posts
Posted on 10/28/20 at 2:54 pm
I'm potentially building an AR15 upper or just buying a pre assembled one. What do I need to know about handguard compatibility? Do only certain types or sizes work with certain upper receivers? Or do you just use adapters? New to this so not really knowledgeable at all on how they come together.
Posted by bbvdd
Memphis, TN
Member since Jun 2009
25007 posts
Posted on 10/28/20 at 2:55 pm to
Most will have their own proprietary barrel nut. Just torque it on and install.
Posted by jlovel7
Louisiana
Member since Aug 2014
21329 posts
Posted on 10/28/20 at 2:56 pm to
quote:

Most will have their own proprietary barrel nut. Just torque it on and install.


So I need to make sure whatever I get has a barrel nut? That's the piece that connects the handguard to the UR?
Posted by bbvdd
Memphis, TN
Member since Jun 2009
25007 posts
Posted on 10/28/20 at 2:59 pm to
and the barrel. Yes.

I have several midwest industries that I really like a lot if you want any names.
Posted by Flats
Member since Jul 2019
21797 posts
Posted on 10/28/20 at 3:36 pm to
quote:

I'm potentially building an AR15 upper or just buying a pre assembled one.


Keep in mind you'll need a few extra purchases if you want to assemble your own upper. Torque wrench if you don't already have one, AR vice block, probably an armorer's wrench.
Posted by SneakyWaff1es
Member since Nov 2012
3941 posts
Posted on 10/28/20 at 5:26 pm to
You also need to buy a gas block that will fit under whatever handguard you buy. If you go with an fsb, make sure the handguard is the right length.
Posted by Flats
Member since Jul 2019
21797 posts
Posted on 10/28/20 at 5:31 pm to
quote:

If you go with an fsb


Posted by armsdealer
Member since Feb 2016
11510 posts
Posted on 10/28/20 at 5:39 pm to
If this is your first rodeo, you don't want to buy all the proper tools (way more than what has been listed) or you are not going to do a bunch just buy something complete from a reputable company.

SOLGW and LMT are my go to for defense rifles right now, Larue UU for precision oriented rifle. Larue will assemble their UU kits for free.
Posted by 90Delmore
Member since Feb 2006
260 posts
Posted on 10/28/20 at 5:47 pm to
Some Handguards (Aeroprecision) won’t work with billet style upper receivers
Posted by bbvdd
Memphis, TN
Member since Jun 2009
25007 posts
Posted on 10/28/20 at 7:06 pm to
quote:

Flats


FSB = front sight base
Posted by Flats
Member since Jul 2019
21797 posts
Posted on 10/28/20 at 7:29 pm to
quote:

FSB = front sight base


I know what it is, I just don’t know why anybody would use one a build.
Posted by Soul Gleaux
Baton Rouge
Member since Sep 2012
4028 posts
Posted on 10/28/20 at 7:45 pm to
quote:

(way more than what has been listed)


Being that an AR vise block set, torque wrench, and armorer’s wrench has already been mentioned, what else would you recommend other than some roll pin punches?
ETA: and some go, no-go gauges
This post was edited on 10/28/20 at 7:48 pm
Posted by Flats
Member since Jul 2019
21797 posts
Posted on 10/28/20 at 7:58 pm to
quote:

Being that an AR vise block set, torque wrench, and armorer’s wrench has already been mentioned, what else would you recommend other than some roll pin punches?


Yeah, I just mentioned the specialty stuff. If they don’t have vice grips, punches and other common tools I don’t think I’d recommend someone do a build.
Posted by mingoswamp
St. Louis
Member since Aug 2017
968 posts
Posted on 10/28/20 at 8:25 pm to
quote:

and some go, no-go gauges


Are these really necessary? I have a few ARs that work fine. By using those BCGs to compare in a new build using a spent casing, would that work in a pinch?
Posted by Flats
Member since Jul 2019
21797 posts
Posted on 10/28/20 at 8:32 pm to
quote:

Are these really necessary?


Not if you buy from a reputable manufacturer.
Posted by X123F45
Member since Apr 2015
27429 posts
Posted on 10/28/20 at 11:54 pm to
quote:

I know what it is, I just don’t know why anybody would use one a build.




Because sometimes people get bored.



And build something unique.
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