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Overall this kit ain’t bad. It fit an Aero M5 lower with no issues and gets the job done. The only complaint I have is with the trigger. It’s bad. Like 8 inch groups at 100 yards. Super stuff, not very smooth. Probably a 7-8 pound trigger. I didn’t expect a great trigger, but there’s some room for improvement.
These fit the Sig Romeo 5 with the cr2032 coin battery. There’s not much lip to grab onto on a Romeo 5, so they do ok for what they are. I got one set that was softer plastic and one set that was harder plastic. Not sure why. The harder plastic set stays on much better. The softer ones tend to fall off. A little dab on super glue took care of it.
Fit and finish are good. Accuracy is good. I’ve shot my 18 inch barrel out to 600 yards easily. The upper is pretty heavy, if you’re looking for a light weight upper, this ain’t it. My other complaint is how close the hand guard is to the barrel. Standard length m-lock screws contact the barrel and the QD hole for the front sling mount is unusable because the barrel is too close to the shroud to let the sling swivel go in far enough. Overall, it’s a decent upper but needs some fine tuning by the manufacturer.