BRT OPTIMUM Barrels

[opngrnd]

Concerning using gas systems that are properly built versus upgrades to legacy systems- I was very surprised at the lack of affect on the Optimum system from using an e-carrier.

Three of my buddies grabbed Blemished Optimum LW barrels when they went on sale. One of them used an e-carrier, but all three ended up with the same gas port size. I thought for sure the rifle with an e-carrier would run one size smaller, but it didn't end up mattering much, if at all. I was very surprised by this, since conventional wisdom has always been (as I understand it) one gas port size size down or one buffer weight up when running the e-carrier.

[1168]

Update 7-18-19
Shot some more. Bench. Hot. Humid. 14x Leupy. No wind. All groups that were fired in the day:

Aguila 62gr 5.56 5rnds: 2.25”
Aguila 62gr 5.56 10rnds: 2.8”
AE 55gr 5.56 5rnds: 1.9”
AE 55gr 5.56 10rnds: 2.4”
Federal GMM 69gr .223 10rnds: 1.8”
PMC Match 77gr .223 5rnds: 1.75”
PMC Match 77gr .223 5rnds: 1.46”
FGMM 69gr .223 5rnds: 1.33”
FGMM 69gr .223 5rnds: 0.627”

Best group so far was FGMM 69gr with 0.627”.

I then proceeded to destroy a 3” sticker at 50m with an Aimpoint.

Round count at this point is ~2980.

https://imgur.com/a/tI4m0ME

[Clint]

Update 7-18-19
Shot some more. Bench. Hot. Humid. 14x Leupy. No wind. All groups that were fired in the day:

Aguila 62gr 5.56 5rnds: 2.25”
Aguila 62gr 5.56 10rnds: 2.8”
AE 55gr 5.56 5rnds: 1.9”
AE 55gr 5.56 10rnds: 2.4”
Federal GMM 69gr .223 10rnds: 1.8”
PMC Match 77gr .223 5rnds: 1.75”
PMC Match 77gr .223 5rnds: 1.46”
FGMM 69gr .223 5rnds: 1.33”
FGMM 69gr .223 5rnds: 0.627”

Best group so far was FGMM 69gr with 0.627”.

I then proceeded to destroy a 3” sticker at 50m with an Aimpoint.

Round count at this point is ~2980.

https://imgur.com/a/tI4m0ME

Thanks for the update.

Always good to see our hardware being used HARD and performing nicely.

How's your 14" upper doing?

[1168]

Thanks for the update.

Always good to see our hardware being used HARD and performing nicely.

How's your 14" upper doing?

I’ve only got about 1,000 rounds through it to verify function. Its on the back burner for the moment, awaiting its own dedicated form 1 lower. It ran nicely in those 1,000 rounds. Paired with a 13” handguard, its probably the perfect length barrel for a general purpose SBR.

[Clint]

When conventional upgrades don't improve anything, that's a pretty good indication the system is nicely Optimized already.

Concerning using gas systems that are properly built versus upgrades to legacy systems- I was very surprised at the lack of affect on the Optimum system from using an e-carrier.

Three of my buddies grabbed Blemished Optimum LW barrels when they went on sale. One of them used an e-carrier, but all three ended up with the same gas port size. I thought for sure the rifle with an e-carrier would run one size smaller, but it didn't end up mattering much, if at all. I was very surprised by this, since conventional wisdom has always been (as I understand it) one gas port size size down or one buffer weight up when running the e-carrier.

[Clint]

This should be the final configuration of the SBT barrel, featuring the EXC gas sysem and shown with a Covert Comp Taper.

[Skeeter98]

what level of mechanical accuracy are these barrels capable of?

[1168]

what level of mechanical accuracy are these barrels capable of?

Not that I can do this consistently in the conditions I shoot in, but, the below cherry picked quotes should give some indication of what the barrel is capable of.

Optimum Light 16”
Best of 4, 5-shot groups Hornady 75gr Superformance Match OTM: 0.9”
.

Better of 2, 5-shot groups FGMM 69gr .223: 0.627”

Round count at this point is ~2980.

https://imgur.com/a/tI4m0ME

[Skeeter98]

Not that I can do this consistently in the conditions I shoot in, but, the below cherry picked quotes should give some indication of what the barrel is capable of.

it will probably be more accurate than I will ever be but those seem nice. This barrel seems like it has a few nice features going for it that set it apart.

[CoryCop25]

Got a BRT 11.5" Suppressor barrel and put this together as an anniversary present for the wife.... Yes, she loves this green and the rifle shoots super smooth!

Untitled by Cory Fluck, on Flickr

Untitled by Cory Fluck, on Flickr