BRT OPTIMUM Barrels

[Ironman8]

Sure.

Most likely SniperFrog's barrel is a CQB-S with the 50/50 porting option. Those had a slightly smaller port than current.

With the new CQB light barrels, the default gas port has been bumped up a half size for mixed use with just a buffer swap.

Our testing results mirror TJ's with full lock back on PMC Bronze with the A5H0 or CAR-H.

Buy with confidence.

One other note: Lock back testing results aren't indicative with a brand new barrel.

Gas drive increases slightly after a little break in when the sharp edges of the gas port smooth out a little and the rest of the gas system seals up.

We like to run the first range session with mostly 5.56 ammo and a lighter buffer, then proceed with any testing / tuning / reliability checks on the second outing.

Thanks Clint, that makes sense. Out of curiosity, about how many rounds does it take to smooth out and seal up the gas system?

[Clint]

30-50 rounds seems like plenty.

Thanks Clint, that makes sense. Out of curiosity, about how many rounds does it take to smooth out and seal up the gas system?

[AndyLate]

30-50 rounds seems like plenty.

That's interesting, thank you.

Andy

[turnburglar]

Just placed an order for my 16" MPC. Got an AFAB in the mail too. Hoping this will be my magically winning 3 gun stick.

[Clint]

Here's one look at the 12.5 MRC setup smooth with a 12.6" hand guard.

[littlejerry]

Here's one look at the 12.5 MRC setup smooth with a 12.6" hand guard.

Cool! Can't wait to get my shipping notification!

[Clint]

Keep an eye out for it.

Cool! Can't wait to get my shipping notification!

Here is the configuration where this really shines; 12.5" + mini can.

With the YHM Turbo-K, this is shorter than a 16" barrel with A2 flash hider.

The 12.0" hand guard is a real tight fit, but works with certain mount combos.

A LPVO or red dot are great choices for sighting.

[littlejerry]

That's perfect! Literally why I bought your barrel. With the Turbo K (even with YHM QD) it's shorter than a 16" with the 3 port brake.

Is that also the new 25mm PA red dot?

[SirSqueeboo]

Now that my second hand Sionics bbl is lost in the USPS black hole, I’ll be buying an 11.5”. Loving the velocity reports.

[Clint]

Yes, that's the new big dot with an A/D micro mount.