Pros, fit and finish are quite nice, lightweight, very accurate. Cons, the gas port is UNDERSIZED, nonstandard gas tube length, Wilson combat isn't particularly helpful. I installed this barrel in my aero M5 build and was not able to get it to cycle properly or extract. I initially installed a standard rifle length tube, which I found was not the proper length (use the Wilson combat rifle length tube instead). This improved performance somewhat as brass would now occasionally extract, but the gun would still not cycle even while testing the full range of the adjustable gas block to find the right spot on the pressure curve. I contacted Wilson combat, who were not particularly helpful. I would have had to de-barrel (gunsmith costs for me) and ship the barrel back for inspection. I explained that issue and they were unwilling to accept the full upper and deal with barrel installs as a courtesy. After reading that Wilson combat barrels are known for gas port issues, I measured the tube opening which is approximately 0.085". This might be the proper opening for a 20" barrel, but it's very undersized compared to data from other manufacturers for 18" barrels with rifle length systems (between 0.091-0.099). I have access to a machine shop, so I'm lucky that I can make this work, but I'm very irritated that it's been such a hassle and mental exercise getting here. For that reason, and for the cost of this premium barrel, you shouldn't have headaches and shouldn't need to take such...
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