My boom stick so far...

[Cali_Ed]

Here is where I'm at guys, almost done just need a couple more parts and I'm done

Si defense upper

tm lower

Magpul Moe rifle stock

magpul moe+ grip

Fortis key mod switch rail

Jp super match barrel/bolt

Now I just need a bolt carrier, gas tube, gas block, charging handle, brake and some sort of temporary sights until I get glass and I'm down :)

Edited May 3, 2014 by Cali_Ed

[BLKSHEEP]

Looking good Ed, how do you like that new Fortis rail?

[Cali_Ed]

I like it, super light weight 8.7 oz,

Just need to by a small rail for my future bipod.

So far it weighs 7.45lbs not sure if my scale is accurate

[Cali_Ed]

Double post

Edited May 3, 2014 by Cali_Ed

[Rsquared]

Lookin good Ed.

[unforgiven]

Way to go brother Ed.

[Robocop1051]

7.45 seems very light for that build. I assumed the barrel would've been near that mark by itself. It's lookin great so far.

[Cali_Ed]

i re weighed it broken down in parts

 

barrel-3.30lb

handguard with barrel nut- .65lb

lower assembly with stock and upper not including charging handle and bolt carrier =3.47lb

 

this time i came up with 7,42lbs

 

im using one of those kitchen scales that measure in different measurements i measured it all in lbs i can go back and do it in oz?

Edited May 3, 2014 by Cali_Ed

[Robocop1051]

Ah, I just noticed no BCG. There's another pound right there. Did you add a buffer and spring yet? It sure looks like you'll be under 10 lbs before optics. Good job on cutting weight.

[Cali_Ed]

Yes those are included in the weight. I hope it's some what light

[Rsquared]

A 308 is only gonna be so light. Just the nature of the beast.

[planeflyer21]

A 308 is only gonna be so light. Just the nature of the beast.

 

Part of the reason Ruger failed with the XGI.

[Cali_Ed]

It's ok if I want something super light I'll pick up my 556 haha

[MONTANA308]

Looking good! I just weighed my SI build its came across the scale at 14.5 with no mag in it.

[mineralman55]

Nice looking build. Will an adjustable gas block fit underneath that rail?

[Cali_Ed]

From the looks of it when I mocked it up, seems the gas block is going to sit right in front of the tube

[Cali_Ed]

So here she is pretty much complete just no rail and glass and the mag is empty, weighed in at 9.67

The only thing I'm puzzled by is my break. I'm sure the 4 little holes it has on one of the flat sides are supposed to be pointing upward but when I screw it on with the washer they face down????

[shibiwan]

So here she is pretty much complete just no rail and glass and the mag is empty, weighed in at 9.67

The only thing I'm puzzled by is my break. I'm sure the 4 little holes it has on one of the flat sides are supposed to be pointing upward but when I screw it on with the washer they face down? ???

 

You need some shims/washers so that it stops with the holes facing up.

 

http://www.brownells.com/rifle-parts/barrel-parts/rifle-barrel-hardware/washers/shim-kit-7-62-5-8-24-0-750-od-sku276000030-60403-126208.aspx

 

http://www.ebay.com/itm/Muzzle-Brake-Alignment-Shim-Set-For-5-8-24-Threaded-Rifle-Barrel-308-SAF0002-/151289555840

 

http://www.gem-tech.com/store/pc/Shim-Kits-for-Mounting-Flash-Hiders-p104.htm

Edited June 5, 2014 by shibiwan

[98Z5V]

It's ok if I want something super light I'll pick up my 556 haha

 

I've got a couple 5.56 rifles that are 10+ lbs, so you're doing alright with this.  That's a nice lookin' .308 AR, right there.  Good work.  <thumbsup>

[gnatshooter]

So here she is pretty much complete just no rail and glass and the mag is empty, weighed in at 9.67

The only thing I'm puzzled by is my break. I'm sure the 4 little holes it has on one of the flat sides are supposed to be pointing upward but when I screw it on with the washer they face down? ???

 

Cali, those four holes go on top. To make that happen, torque the snot out of it for 1/2 turn. There's another thread over here

 

on how to hold things still whilst torquing. Even so, I like shibiwan's idea of multiple thin washers better.

[survivalshop]

Some Muzzle device manufacturers sell those shims & there is always a crush washer .

[Cali_Ed]

I don't think I'd want to over torque it, would washers from a hardware store work or does it have to be those specific osnes?

[gnatshooter]

I don't think I'd want to over torque it, would washers from a hardware store work or does it have to be those specific osnes?

 

Washers from a hardware store will work -- but there's the issue of outside diameter being larger than the barrel/brake, and it's good to have a variety of thicknesses, which you wouldn't get at the store.

 

I'd recommend something like this:

 

PRIMARY WEAPONS - .308 MUZZLE DEVICE ALIGNMENT SHIMS $4.99

http://www.brownells.com/rifle-parts/barrel-parts/muzzle-brakes/ar-15-m16-ar-style-308-muzzle-device-alignment-shims-prod38890.aspx

 

"Small shims used with large and medium shims provide smaller degrees of rotation for finely-tuned, critical alignment."

[shibiwan]

Install shims, followed by crush washer. Then install the muzzle device and tighten it hand tight - it should be about 1/4-1/2 turn from the correct position. If it isn't, then try a different washer or add/remove washers until it's right. You can then tighten it up to the correct angle and everything should be peachy.

[gnatshooter]

I have to wonder if you guys would recommend that Cali_Ed use a version of Loctite for holding the clock on the muzzle brake.