NFA newbie- dedicated suppressed 11.5" build questions

**shaneinhisroom** · 12-14-12, 11:01

Hi guys, I've been doing a lot of research but couldn't find the answers I was looking so I figured I'd give it a shot here:

I have a Huntertown Arms 5.56 Kestrel coming, maybe another 1-2 months on the stamp. Same timeframe for the SBR stamp. IN the meantime I am preparing my SBR build and I have a few questions:

Here's what I got so far:

Registered BCM Lower built by Grant with Geissele SSA, suggested I go with H2 buffer and blue Springco Spring. Question 1: I've heard posts here recommending H3 buffers and green Springco springs? Thoughts?

The upper:
BCM 11.5" upper with DD RIS II handguards
Question 2 : For a dedicated upper, who can do work on the gas port or should I go with a Switchblock? Is stock alright?

Other parts of the rifle include Surefire X300, Aimpoint T-1 / LT660, Larue Handstop and MS3 sling.

I mostly shoot PMC Bronze due to price but will try to buy M193 variants whenever this price surge cools down.

Goal of the rifle: all purpose. Must be ready for home defense, range, classes, etc. I do have a backup 16" BCM/DD rifle but I want this to be as reliable as humanly possible.

Thanks in advance.

**LTMattyL** · 12-14-12, 14:10

Green springco springs are for rifle length systems i.e. Vltor A5.....it won't work with your carbine setup. You will more than likely be good to go with the H2 and blue springco spring.

I don't own a BCM 11.5" upper, but everything I have heard is that it will be good to go as is. I belive if you wanted to get a switch block you would have to dump the DD rail due to clearance and access issues for when you would want to switch settings. Just look at a noveske 10.5" upper with switchblock and you will see what I mean.

Overall it looks like you will have a solid rifle. I would put it through its paces once it is togther then go from there.

**TehLlama** · 12-17-12, 00:24

If you can get an upper with a reduced size gas block (for a pure dedicated host), you can run much lighter buffers. Even having gone that route, since I'm running a somewhat longer ACS stock anyway, I'm still running a VLTOR A5, and really happy with it.

**markm** · 12-17-12, 12:02

If I were going dedicated, I'd get the port sized accordingly.

I'm not even sure how one goes about this. Almost everything out there is over gassed to some degree.

**fixit69** · 12-17-12, 12:55

Kind of have to agree with markm.

Are you going to be using the lower on another upper? If so you might want to look at a few more options.

**shaneinhisroom** · 12-17-12, 13:02

No, this lower will be mated just for the suppressed SBR. I have no problem putting a H2 and blue spring in there, but I have no clue how to get the gas port correctly sized. What do I have to do and is it worth it, especially if I shoot a variety of ammo?

**Rodman24** · 12-17-12, 13:18

A 7" rail will fit behind the Noveske switchblock on a carbine system. But unless you buy a Noveske barrel, you'll have to use the clamp on version.

I don't care for either if those limitations.

You could always try an adjustable has block to reduce the amount of gas in your face, but I think you'll be fine with the H2 and blue Springco.

**Rodman24** · 12-17-12, 14:03

Originally Posted by shaneinhisroom

Thanks, so basically, you recommend getting the SYRAC and tuning the flow to whatever buffer spring combo I choose.

This what I'm considering on my 10.3"

As was mentioned above, the spring and buffer only slow the cyclic rate. I'm a lefty and I get a bunch of gas in my face. After a while it wears on the eyes.