Rainier Arms x JMAC Customs .223/5.56 Summit Brake Plan B Mount

Rainier Arms x JMAC Customs .223/5.56 Summit Brake Plan B Mount

Rainier Arms
$81.00
Current Stock:
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Description

Summit Achieved: Introducing the Rainier Arms Summit Brake Mount. At Rainier Arms, we don’t just aim for the summit — we start there.

Introducing the Summit Brake — the newest evolution for your RUC and AR-15 .223/5.56 style rifle, engineered to dominate muzzle rise, tame recoil, and safeguard your Plan B equipped suppressor with precision and confidence.

Crafted from 17-4 PH stainless steel and finished in a heat treat finish, the Summit Brake was built for shooters who demand the best — from their equipment, and from themselves.

With its aggressive angled internal baffles — inspired by the natural ridgelines of Mount Rainier — the Summit Brake redirects gas forces to reduce recoil and minimize muzzle rise. Faster follow-up shots. Tighter groups. Complete control.

A precision .900x24 taper mount interface ensures perfect suppressor alignment, compatible with industry-leading systems like Plan B and Atlas taper adapters. It’s designed to take the brunt of muzzle blast, dramatically extending the life of your suppressor while delivering a rock-solid, repeatable lock-up and protecting your threads from carbon lock.

The Summit Brake is a collaboration between Rainier Arms and JMac Customs, both known for high quality firearm accessories.

Lightweight, durable, and fiercely effective, the Summit Brake isn’t just an upgrade — it’s the pinnacle of performance.

When you're running the Summit, you’ve already reached the top.

All that's left is to own the high ground.

 

Specifications:

  • 17-4 PH Stainless Steel

  • Heat Treat Finish

  • Overall Length: 1.77”

  • Added Length: ~1.17”

  • 0.26” Bore 

  • ½-28 Shoulder Mount Threads 

  • Flats for armorers wrench / ¾” wrench