My .300 blackout SBR build.

[daddyusmaximus]

I bit the bullet.

The .300 AAC Blackout bullet.

I dropped off my worn out SBR upper (Arms Tech Compak 16) at my new gunsmith because I couldn't get the gas trap off to switch out to a Danial Defense Lite rail, and he can't get it off either. Add to that the tough time getting a hold of Arms Tech for their propriatary gas tube (that I also needed) and I made the decision I've been thinking about for some time. I'm going with the .300 for the SBR. Got the Wilson Combat 11.3" stainless barrel ordered, and the Surefire muzzle brake to go with the SOCOM300 SPS I plan to get one day.

Going to be a long two weeks waiting...

 

[TNLongShot]

I'm about to embark on the adventure of building my first upper. I'm trying to decide on the barrel length I want. Mainly this build would be for suppressed work from 25 to 100 yards. I have a Rem 700 chambered in 300 blackout as well for more of a bench gun. I'm thinking 8.5", but today I had two separate instances where 10.5" was recommended (a gunsmith and later a guy at the range shooting a 10.5" build out to 200 yards). I see that there's a little boost in velocity, but I'm wondering if for what I'm building it's worth the extra 2". Also, am I understanding it correctly that an 8.5" barrel may not cycle unsuppressed? My can will probably be on it 99.9% of the time, but I would have to consider the longer length just for that.

 

[jd4320t]

I'm about to embark on the adventure of building my first upper. I'm trying to decide on the barrel length I want. Mainly this build would be for suppressed work from 25 to 100 yards. I have a Rem 700 chambered in 300 blackout as well for more of a bench gun. I'm thinking 8.5", but today I had two separate instances where 10.5" was recommended (a gunsmith and later a guy at the range shooting a 10.5" build out to 200 yards). I see that there's a little boost in velocity, but I'm wondering if for what I'm building it's worth the extra 2". Also, am I understanding it correctly that an 8.5" barrel may not cycle unsuppressed? My can will probably be on it 99.9% of the time, but I would have to consider the longer length just for that.

I can tell you my Noveske 8.2" cycles flawlessly unsuppressed. I'm also very happy I chose the 8.2"

 

[TNLongShot]

I can tell you my Noveske 8.2" cycles flawlessly unsuppressed. I'm also very happy I chose the 8.2"

That's good to know, thanks.

Sometimes I think I should just by a complete upper instead, that the purpose of the rifle doesn't require a match grade barrel, etc. Decisions, decisions! Aero precision has an upper for $440, CBC $310, BCM on the upper end at $640.

 

[jd4320t]

That's good to know, thanks.

Sometimes I think I should just by a complete upper instead, that the purpose of the rifle doesn't require a match grade barrel, etc. Decisions, decisions! Aero precision has an upper for $440, CBC $310, BCM on the upper end at $640.

It wouldn't be a bad idea as long as you can get what you want and not change out parts.

 

[daddyusmaximus]

This is the foundation of the build... My old SBR with a Arms Tech Compak 16 upper.



I will be using my current SBRed lower.


Spikes Tactical forged lower
DPMS LPG
Magpul Enhanced trigger guard
Hogue Overmolded rubber pistol grip
JP Enterprises trigger, hammer, and springs
Mil spec buffer tube
Troy Industries end plate sling mount (will change)
Enidine AR-restor hydraulic recoil buffer (may have to change)
Tactical Springs “RED” extra power buffer spring (may have to change)
Urban-E.R.T. sling.
VLTOR Clubfoot Modstock carbine stock (will change with the MagPul CTR stock from my 16" AR)

Most of the parts from the upper will stay with the new build.

Tango Down vertical fore grip that contains a complete spare bolt
Young Manufacturing Chrome M16 National Match BCG
Rainier Arms Raptor charging handle
Troy Industries front and rear folding BUIS with Tritium inserts
Aimpoint Comp M4s
Surefire M300 Mini Scout light

Getting rid of the POF Predator series P-9SX free float rail. This is what started the build. I wanted to change to the Danial Defense Lite rail, but couldn't get the gas trap off, so I took it to the gunsmith, who also couldn't get it off. He boogered up the barrel trying, and when he offered to replace the barrel for me, I had him get a .300 Blackout one. He ordered a Wilson Combat 11.3" stainless 1/8 twist barrel. Going with a Surefire brake since I plan a can in the future.

 

[Nicu757]

I have a 8.3 from ballistic advantage. I had Clint build the upper for me and all I can say is it's awsome. I wanted to build it myself but he dialed in the gas perfect. Shoots supers and subs no suppressor no prob. Then the best part when a can is on no gas in face at all. With 300 blk and what you want it for go short. Mine is a 1 inch gun at 200 no prob. Contact Ballistic advantage it's there specialty suppressed guns.
https://m.youtube.com/watch?v=696x2WWjpvg this is the man here shooting my build.

 

[Nicu757]

I also went with the surefire muzzle device and a Daniel Defense rail along with other DD parts.

 

[daddyusmaximus]

Ballistic Advantage looks like good stuff. I may research them for my .308 build. My Wilson Combat .300 Blackout barrel is already on the way.

 

[daddyusmaximus]

As it looks so far. Barrel finally came in. Still waiting for my ammo from bulkammo.com, tracking says out for delivery today.

Not sure if I'll need to change out the buffer or spring to get her running right, (using the old 5.56 SBR lower) but we'll see once I get her to the range.



11.3" .300 Blackout.

Arms Tech Limited Compak-16 upper
Danial Defense Lite rail
Tango Down vertical fore grip that contains a complete spare bolt
Daniel Defense Chrome M16 BCG
Rainier Arms Raptor charging handle
Troy Industries front and rear folding BUIS with Tritium inserts
Aimpoint Comp M4s
Surefire M300 Mini Scout light
Stainless 11.3” Wilson Combat 1/8 twist barrel
Surefire SOCOM flash suppressor

Spikes Tactical lower
DPMS LPG
Magpul Enhanced trigger guard
Hogue Overmolded rubber pistol grip
JP Enterprises trigger, hammer, and springs
Mil spec buffer tube
MagPul CTR stock.

 

[Grimmis]

How do you like that flash hider? I've been trying to find a muzzle device for my 300 BLK AR pistol. The muzzle device I put on was not my greatest idea.

 

[dsol]

Anyone got leftover parts they might want to get rid of? Was considering swapping the barrel on a 16 inch 223 I bought to customize or just go with something like a Hardened Arms or Primary Arms 10.5 inch 300 Blackout upper assembly.

 

[daddyusmaximus]

Not happy about the flash hider. I wanted the muzzle brake. Went Surefire because that's the suppressor I'll get for it one day. It works good enough, but it rings like a damn tuning fork.

 

[Grimmis]

I love the 300 blk round in a short barrell. My only issue is the price of the ammunition. It's hard to get a lot of practice when it costs $15 a mag. I need to get set up the reload it.

 

[daddyusmaximus]

That's what kept me from trying the blackout for so long. I may have to get into reloading as well.

 

[SteveM4A1]

That's what kept me from trying the blackout for so long. I may have to get into reloading as well.

We are getting there. Not too long ago, the cheapest I could find was $.75. Now with Magtech and S&B ammo around $.50, it is starting to take a turn for the better.

And yes, I am aware that Ozark is consistently cheaper than that. I just choose not to use it right now.

 

[WyldeShot]

I am working on my SBR now too. My lower is finished, just waiting on a stamp.\

Build sheet is
Lower
PSA Stripped lower
PSA enhanced polished fire control group
Magpul grip and trigger guard
Mission first stock
Standard H2 buffer for now but will be getting a JP silent buffer

Upper (will be)
PSA stripped upper
KAK 8.5" 1:8 barrel
KAK NiK BCG
JP Adjustable Gas Block
UTG Pro Handguard
Gunfighter charging handle
YHM flash hider or muzzle break

 

[tacticalmaster45]

I am working on my SBR now too. My lower is finished, just waiting on a stamp.\

Build sheet is
Lower
PSA Stripped lower
PSA enhanced polished fire control group
Magpul grip and trigger guard
Mission first stock
Standard H2 buffer for now but will be getting a JP silent buffer

Upper (will be)
PSA stripped upper
KAK 8.5" 1:8 barrel
KAK NiK BCG
JP Adjustable Gas Block
UTG Pro Handguard
Gunfighter charging handle
YHM flash hider or muzzle break

Please report back once your 300blk is setup - I'm curious about the JP silent capture system and want to hear your experience.

 

[WyldeShot]

Please report back once your 300blk is setup - I'm curious about the JP silent capture system and want to hear your experience.

Will do. It will probably be awhile since I submitted my Form 4 at the beginning of the month. I'll admit that it will be hard spending $225 on a buffer. I've heard great things though.

 

[SteveM4A1]

I have a JP silent buffer. If you want to go to a range sometime to try it out, let me know.

My opinion, much quieter than the cheese grater.