Putting together a new upper from strach

[RC3]

I have a BCA side charging upper left over from a build I wrote off last year. So now, I want to use it on a new upper.

I have tracked down the parts I need and want to know from someone with more experience if the list is right

1) 10.5 in barrel with a carbine length gas system   https://www.bearcreekarsenal.com/b556cm410-518-ss

2) .750 low profile gas block (Ergo .750 low profile adjustable)

3) Gas tube carbine length (Stainless one, forgot the brand, have)

4)Flash hider ( Already have)

5) AR 15 barrel nut

6) Rail

7) Upper and bolt carrier group (already have)

 

But I am having a little issue on the barrel nut and the rail. I keep seeing mixed info about it. Some say the rail will come with a barrel nut, others say it is separate. If someone can point me in the right direction, that will be awesome.  All the parts marked orange are in my possession, so I dont need them. Unless someone can show me where to get a better part at a good price.

[Photoguy67]

It depends on the rail, some come with a barrel nut, some do not. Best bet is to figure out which one you want and see if it comes with one.

[Photoguy67]

I would suggest an adjustable gas block. Just a suggestion, but it can make it a little softer shooting and less blow back. Up to you if it's worth the extra cost though.

 

[RC3]

38 minutes ago, Photoguy67 said:

I would suggest an adjustable gas block. Just a suggestion, but it can make it a little softer shooting and less blow back. Up to you if it's worth the extra cost though.

 

The gas block I got is adjustable

[Garufa]

Many true “free float” rails will come with their own, usually proprietary, barrel nut.  There are also “semi free float” bolt on type rails that attach to a standard barrel but.

Priorietary nuts aren’t much of a problem, just make sure the rail kit comes with a wrench or will use a standard AR armor’s wrench.

Edited January 5, 2019 by Garufa

[RC3]

I ordered a FM-9 10.5in rail and it comes with its own barrel nut. Everything is ordered, now all I need is to find a spikes punisher lower.