The OPS R3E2C muzzle brake has been receiving excellent reviews and we decided to install one on our 243 Winchester Remington model 700.
Installation of the OPS brake will require us to thread the barrel and time (make sure the ports are up) the brake. While we have the barrel mounted, we will also make a custom thread protector.
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We ordered the following items from Brownells:
- 3/8″ High-speed steel turning kit (080-000-835)
- High-speed steel 35 degree profile kit (080-000-836)
- 1/2″ threader (080-000-839)
- Starrett Dial indicator (749-007-761)
- OPS R3E2C muzzle brake (504-000-014)
In addition to installing the OPS R3E2C muzzle brake , a thread protector for the applications when we wouldn’t want to use the brake will be fabricated.
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The barrel is then reversed in the head stock of the lathe. A range rod is used to dial in the bore.
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The tenon is threaded for the brake. In this case, 24 threads per inch. This brake, like many other directional brakes on the market, needed to be timed. This means there is a top and bottom. On preexisting builds this is typically accomplished with the use of shim washers. On new construction, the preferred method is to time the brake on the barrel.
To time the brake, the brake was installed after the tenon was threaded and cut. The orientation of the top of the brake and top of the barrel were noted. The tenon’s shoulder was then incrementally re-cut until they aligned
To determine how much the shoulder needed to be set back, 1 was divided by the number of threads per inch. In our case, 1/24=.042″. This means for every .042″ the shoulder is set back, the brake will turn one revolution. To make a half turn, divide this value in half, for a quarter turn by four and so on. So if the brake needed to be turned one half revolution, (.042″)(.5)=.021″. A .021″ cut allowed the brake to rotate one half a turn.
In practice, we made lighter cuts then needed to avoid taking off too much material. If the shoulder is set back too far, the shoulder will need to be set back for nearly one full revolution.
The brake is screwed into place. Note that the outside diameter of the barrel and the brake match. This was by design. The shoulder of the tenon was located at the precise point that the diameters matched. If you plan on turning down a brake, make sure you can- in the past we attempted to turn down a similar brake and it fell apart because there wasn’t enough material left after we got it to the correct dimension. 
To make a thread protector, we start with a scrap piece of stainless steel. This is a cut off from a barrel blank that was drilled and tapped 5/8-24. 
Side view of the blank. 
After turning down the outside diameter of the thread protector, the area is sanded with some abrasive cloth. A perfect match. 
A recess was cut in the threaded part of the muzzle and a slight taper cut into the thread protector.
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