Otis 5.56MM Chamber Brush


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  • Base steel bristles
  • Standard 8-32 thread
  • Cold welded brass stem
  • Cleans the chamber of 5.56MM Rifles
  • 8-32 Thread Size
  • Tapered bronze bristles scrub the chamber, neck and shoulder
  • Steel bristles at the base scrub the star chamber of the locking lugs
  • Brass stem is cold welded to the core, and the tip is folded, not cut


Otis Technology

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The 5.56mm chamber brush is an essential tool for anyone that shoots a 5.56mm rifle. The tapered bronze bristles scrub the chamber, neck and shoulder. Features:- the steel bristles at the base scrub the star chamber of the locking lugs. - the brass stem is cold welded to the core, and the tip is folded, not cut. The chamber brush has a standard 8-32 thread.""

Product details
  • Product Dimensions: 1 x 1 x 1 inches ; 0.16 ounces
  • Shipping Weight: 0.6 ounces (View shipping rates and policies)
  • ASIN: B000E59A8E
  • Item model number: FG-367-TP

We have used star pads for cleaning the chamber in the past, but wanted to get a bit more aggressive with the build-up. This seemed like just the right additional to our cleaning kit based on reviews. I have the right rod set, cleaners and lube.

It is a good tool for the purpose, the bristles do work well to break loose the deep seated grime, but this chamber brush is not perfect. It is incredibly tight, so much so that I worry about marring.

Afterwards I noticed several copper bristles left behind in the chamber, laid down tight in the crevices such that a pointy pick was needed to get in there and lift an end allowing tweezers to lift the bristle out. That was an unexpected pain; hopefully that will not be commonplace as the bristles break in a bit and become easier to use.

Cleaned well. Had a few issues. Might get better with time. Will come back and revise review if future applications do not show improvement over first use.

Very handy brush. Works well to loosen up all the chamber fouling so it can be cleaned out with a bore snake and an AR cleaning star. I just squirt some Zippo fluid on it, push it in, and rotate it a few times around (Zippo fluid is a decent solvent that evaporates without residue, so you don't have to work hard to then clean out the solvent you just used). The one thing to know is that it fits tightly in the chamber, so you can't just spin the cleaning rod with your fingers. If your cleaning rod has a fixed handle at the end that will work. If the handle spins, you'll need something to grip the cleaning rod so you have enough torque to rotate it. I clamp a pair of vise grips to the cleaning rod and then just rotate the vise grips. Works out great. I don't fault this product for that drawback, so much as the makers of most cleaning rods.

I bought this to clean a 223 Wylde that I recently built. It seems to work well on the end of a pistol cleaning rod. I didn't realize at first, but you're supposed to insert and then spin it clockwise. I thought it was more of an in/out motion (ha!). Do this first, then clean the barrel from chamber to muzzle and you're good to go.

Superior in my opinion to the others I've bought. The brush tapers at the end and the metal folds over on the tip, leaving a round end. Many other brands I've bought are longer and the metal tip is just cut off and jagged. I would never put a jagged tip in my rifle and turn it. I'll stick with this brush. 5 star in my opinion.

This brush is definitely the same quality I have come to expect from Otis, which is top notch. This brush cleans those very difficult nooks around the chamber very well. I have used this brush for around 200 passes through my AR now and it is still looking like new.

I will note that you do need a rod, the Otis pull through system just does not have enough tensile strength to get this all the way into the chamber easily. So if you only have an Otis puck system be sure to build a rod into your cost (a short handgun rod works great).

It is a specialty brush and it does cost a lot for what it is, but it works well and it seems like it is going to work for a long time as well. 5 Stars.

Bought alot of these in the past and this ilone is actually really nice. Havent even used it yet, but its definitely built better than most and has really tough and dense bristles, especially on the chamber section

I have a AR-15 that I had put a couple hundred rounds through and found cleaning the chamber was not a easy task. I remembered way back when we had a brush for the M-16 made for just what I needed. I found this on Amazon and all the reviews said get one, so I did. Talk about fast shipping I had it in less than two days. I promptly got out my 15 and hooked up the brush to my pistol cleaning rod and walla I had a bright clean chamber. The other thing that impressed me is the fact it is guaranteed for life. I strongly recommend this brush to anyone that has a .223/5.56 rifle.

This does not fit a USGI or Mil-Spec cleaning rod. Plus some of the bristles fell out first time I used it.

You really need this to do a good cleaning...