Starting 300BLK SBR build

**SeattleDude** · 27 December 2014, 21:22

Made another pic. post down.

**SeattleDude** · 2 January 2015, 13:21

Build is slowly continues.

Raptor Charging Handle
RA Forged A4 Upper
RA Extended Mag Release

**SeattleDude** · 12 February 2015, 18:26

Finished my Build.

Here is the finishing list of parts on top of the once already listed in this thread.

Rainier Arms Ultramatch 300BLK 8.5inch barrel
Noveske Syrac Gen II adjustable block
SpecWar Trifecta can quick mount
7 inch RA Force rail
Bobro extended 30mm scope mount
Viper PST TMCQ Mrad 1-4x24 scope
JP Silent Captured spring system

**toolboxluis00200** · 12 February 2015, 18:35

looks good congrats ;

**SINNER** · 12 February 2015, 18:36

Turned out very nice. I just love the look of a well finished forged lower. Funny part is I have that exact optic in that exact mount. My Bobro is the Trijicon badged one though.

**UWone77** · 12 February 2015, 19:21

I'd pin that gas block.

Otherwise, looks great.

**SeattleDude** · 12 February 2015, 21:07

Originally Posted by UWone77

I'd pin that gas block.

Otherwise, looks great.

Being semi auto and very soft shooting 300BLK I really dont see a need for pinning it. I wll not be doing any mag dumps or high rate of fire for any extended periods of time.

Its dimpled and installed with high temp rocksett.

But thank you for the comment =)

**UWone77** · 12 February 2015, 21:11

Originally Posted by SeattleDude

Being semi auto and very soft shooting 300BLK I really dont see a need for pinning it. I wll not be doing any mag dumps or high rate of fire for any extended periods of time.

Its dimpled and installed with high temp rocksett.

But thank you for the comment =)

Here's a buddy's gun after a 400 round day of suppressed 300 BLK shooting. He couldn't figure why he had a single shot gun and brought it over.

Generally, I get all my gas blocks pinned. If you're just going to use it as a range toy, then yeah, the worst that'll happen is, your day will be cut short.

**SeattleDude** · 12 February 2015, 21:31

Yup. For now it will be a low volume shooting gun. My range only allows 1 shot at the time 1 bullet at the time and 300BLK is not exactly cheap even though I reload.

I don't plan to shoot 400 rounds a day or 200 or even 100. So I will keep an eye on it and if more shooting will be happening, I will consider pining.

Syrac doesn't have a hole for pinning. Is it ok to use pining jig tool and drill your own hole?

**SINNER** · 13 February 2015, 05:21

Yup. I use a BRD jig but they are gas block specific. I do not taper ream and use a tapered pin, I just use a roll pin. As a test I installed a VLTOR gas block with a roll pin and removed both set screws. I put over 2,000 rounds through that barrel before I re-installed the set screws. Lots of back pressure acting on that gas system with a can. I have seen well tested guns have the gas block shift first time a can was ran on it.

**SINNER** · 13 February 2015, 05:22

Originally Posted by UWone77

Here's a buddy's gun after a 400 round day of suppressed 300 BLK shooting. He couldn't figure why he had a single shot gun and brought it over.

Generally, I get all my gas blocks pinned. If you're just going to use it as a range toy, then yeah, the worst that'll happen is, your day will be cut short.

Curious if that barrel was dimpled or just tightened on the barrel?

**UWone77** · 1 March 2015, 20:09

Originally Posted by SeattleDude

thank you!

Camera is my old Nikon D200 nothing too crazy here =)

Bench, yes I love it and you can get your own from Uline, they have warehouse in Auburn for pick up.

I have two of them. One pictured for my progressive press and gunsmithing (Maple Top 72x30) and one for my Presicion Rifle reloading (Maple Top 48x30)

I also added top shelf on both benches. Great bench! Very Very sturdy and legs are adjustable for sitting or standing.

http://www.uline.com/BL_3853/Industrial-Packing-Tables

Looks like we're moving this summer. I think I'm going to get a couple of those uline benches. Where's the best place to order those from? Direct?

Originally Posted by SINNER

Curious if that barrel was dimpled or just tightened on the barrel?

It was a dimpled barrel. Sorry I didn't see this before.

**alamo5000** · 1 March 2015, 20:21

Originally Posted by SeattleDude

Holy smokes man. That is awesome.

**alamo5000** · 1 March 2015, 20:25

Originally Posted by UWone77

I'd pin that gas block.

Just curious but what benefit would be brought from pinning the gas block? What does it all entail to pin one? Can you elaborate please?

**UWone77** · 3 March 2015, 00:48

Originally Posted by alamo5000

Just curious but what benefit would be brought from pinning the gas block? What does it all entail to pin one? Can you elaborate please?

Simply using set screws to hold a gas block in place is not sufficient in my opinion. The gas block can and will move with use. Look at the picture several posts above.

You'll need a gas block like an 87 Industries one to do it yourself, or a drill press and the correct bits to do any gas block.

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