BRT OPTIMUM Barrels

[WEK207]

For any one interested,

I emailed Precision Armament about their EFAB's performance when used on a barrel like this. Here is their response:

While I don't have any exact numbers for you, we have tested this. There will be some performance degradation, but it's certainly less than 10% off of our advertised percentages (in terms of flash suppression and recoil reduction). Another option would be to use the 5.56 EFAB, and re-thread it with 5/8x24. Just throwing that out there!

If it could be rethreaded, that would be most ideal for me. Anyone know a smith willing to do that sort of thing?

[Biggy]

Also, for anyone wanting to go from 1/2-28 to 5/8-24 threads. This might be another option for you.

https://precisionarmament.com/produc...read-adapters/

[ASeabrook]

This might be another option for you.

https://precisionarmament.com/produc...read-adapters/

I think this is the reverse of what he is asking for- this takes a 1/2 barrel to 5/8, whereas he has a 5/8 barrel and wants a 1/2 muzzle device.

Or I'm completely off base

[ASeabrook]

For anyone else curious about the 5/8 vs 1/2 thread thing on 5.56 barrels like these, I did some digging and found this thread from last year:

https://www.m4carbine.net/showthread...ds-on-5-56-223

Clint and others in that thread make it easy to understand.

[Skeeter98]

What kind of accuracy or precision do these barrels typically see? And what type of ammo do they like the best? Specifically the BRT optimum light 16 inch barrel.

[opngrnd]

What kind of accuracy or precision do these barrels typically see? And what type of ammo do they like the best?

Which barrel in particular? I'll be sighting in an MPR pretty soon.

[Skeeter98]

Which barrel in particular? I'll be sighting in an MPR pretty soon.

Specifically the BRT optimum light 16 inch barrel.

[opngrnd]

Attachment 55748

LW Optimum barrel:
My buddy(who is typically an excellent group shooter) shot this 200 yard group with 55gr Fiocchi ammo. He called the shot on the outside. He was a couple shooters to the right of me on the firing line when he shot the group. It's about a 4" group minus the called flyer.

[opngrnd]

Finally got out to start shooting the MPR barrel and I'm pretty happy with it. The conditions were horrid, -4 degrees and -30 Realfeel, with the wind in my face. I set a target between 55-60 yards(50 yard marker is under a snow berm, I made sure to exceed it), and started dialing in the scope. I threw several very hasty 3-shot groups while checking how the scope tracks before making a final adjustment and throwing a final 5-shot group. It's a great start, esp in such nasty conditions. Ammo was 62gr bthp handloaded, and this 30 minute range pit stop takes 1st place as the most painful range session of my life. Final group was .397 center to center according to my calipers (I measured outside edges and subtracted .223).
Attachment 55833
Attachment 55834
Attachment 55835

[CoryCop25]

Now that’s dedicat!!!
Thanks for the update.