So what exactly is the CRD? The CRD is just the outer shroud that can be quickly attached or detached from the FERFRANS muzzle brake. The CRD and the muzzle brake together make up the FERFRANS CQB Modular Muzzle Brake System. What the CRD does is gives the operator the ability to shoot their AR-15 with a muzzle brake without the chest thumping concussion, which explains its handle—Concussion Reduction Device.
I took the opportunity to fire my AR-15 both with and without the CRD attached to the FERFRANS muzzle brake. Right off the bat, I discovered it performed as I expected. But, instead of stopping there, I sought out a second opinion. I met a gentleman by the name of Mr. Brewster at the range that day. I figured he would be a good candidate to help me since I had never met him previously and he had never seen or heard of a FERFRANS CRD before. I asked him if he would like to help me out with reviewing an item and he told me “Oh sure, you betcha.” (We are from Minnesota after all).
FERFRANS CRD Review - thearmsguide.com
While shooting at the range, Mr. Brewster was impressed with the reduction in concussion when I shot my AR-15 with the FERFRANS CRD.
I fired my AR-15 five times with the CRD attached with Mr. Brewster volunteering about 5 feet to the right of me. I think he took a few brass ejections to the chest, but he didn’t seem to mind. I then removed the CRD so I would only be utilizing the FERFRANS muzzle brake and took five more shots. After Mr. Brewster gracefully withstood some more brass to the chest, I asked him if he could sense a difference. He told me that he felt much less concussion when the CRD was attached compared to without it.
Based on my own opinion and also the opinion of a completely neutral party, I can say that the FERFRANS CRD does just what it’s supposed to do. It reduces the concussion from the muzzle brake to a more comfortable level while still maintaining the flat shooting benefits of a muzzle brake.