I drove out to the desert this Monday with a couple friends and a few thousands rounds of giggle pills. Ran some informal movement drills, and some rapid fire drills. Setup up a course of fire and did some impromptu team drills. We had an amazing time. We did, unfortunately, choose our course on an incline so we worked the hell out of our legs, I'm still damn sore. It was pretty damn hot and we burned the hell out of our necks and arms. All in all, just a great time with some friends! I had a chance to shoot some various muzzle devices side by side. Unfortunately, since they are tuned and I didn't have enough crush washers I was only able to shoot them side by side one another. I really didn't want to take a wrench to my friends guns (I'm sure they would have let me). I just lined them up and shot a couple mags through each one after the other. 1) Rainer Arms RUC 16" LW profile barrel. Mid-length gas and standard carbine buffer spring. Aimpoint H-1 Micro. I have approximately 2000 rounds (and less than a month old lol) For the sake of this test I swapped out the H buffer with a standard carbine weight buffer. This is my rifle so I started out with the RA XTC compensator, swapped out the Effin-A later. 2) Stag 1x9 16" m4 profile, carbine gas system, standard carbine buffer, standard buffer spring, PWS FSC 556, Primary Arms M4 clone. Approx 1500 rounds. 3) Stag 1x9 16" m4 profile, carbine gas system, standard carbine buffer, standard buffer spring, PWS FSC TTO. Eotech XPS2 Approx 3000 rounds. 4) Sabre Defense barrel, m4 profile, 14.5" mid length gas system, standard carbine buffer, standard buffer spring. Primary Arms Micro clone. Approx round count 3000k rounds. I will try stay entirely objective there, tho all my observations are purely opinions. I shifted my stances, how I gripped the forearm and did not use a sling when testing. I use the cheapest ammo I had, MFS 62 gr steel cased soft points. A little disclaimer, this is not a test of all things being equal. The only thing I could change would be the buffer and springs to try and keep things equal. The setup / best brake is .....drumroll please....the Surefire 556K. It simply had the most recoil reduction. The most recoil reduction and the most blast. Rated for purely recoil reduction: Surefire>PWS TTO>PWS FSC>RA XTC>Effin A. This is bit surprising as the TTO is basically a shorter version of the FSC. But its understandable, once you factor it weight. The Stag with the TTO was the heaviest, with a surefire flashlight, 12" quad rail and ACS stock. Now my carbine came in dead last. I admit it. Not a problem to me, because even the M855 and XM193 with a standard flash hider really doesn't recoil all that much. With the exception of the Effin-A the difference between the recoil reductions between the Surefire, PWSs and RA is very slim. Barely there. No really. I had to really sit there, focus on the rifle, and concentrate on just how much recoil I was feeling. I wasn't even aiming (just making sure it was pointed down range). I pulled it tight, I pulled it in as tighter, I barely held the rifle. These are all very very nice brakes. They all reduce recoil very very well. I will have to admit tho, the RUC is the lightest, the only one with a LW profile barrel so in theory it should recoil the most. To a regular Joe Schmo like me, the recoil reduction differences between the Surefire, RA and PWS devices are minimal, almost negligible, that I'd honestly recommend them by price. I'd only recommend the Surefire if you wanted a suppressor later, or had a shorter barrel (its really long, I'd venture a guess that you could pin weld it onto a 13.7" barrel if you wanted to). BTW they are all annoyingly blasty and loud, well except the Effin-A.