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Very nice kit. It DOES include a silver mock-up gas tube that isn't shown in the picture. The mounting ring threaded on easily to a Guarder SR-16E3 metal upper. The OD on the kit is more Olive color than the OD green used by Guarder on their receivers though. I am using this for a DMR rifle with the Madbull 590mm inner barrel. The longest barrel extension fits perfectly. You might have to do some modifications to the gas tube based on your upper reciever. See below.
Very well built
Looks nice with long barrel as DMR
Free floating hand guard
Gas tube is too long if your upper receiver doesn't have the gas tube hole behind delta ring drilled through. You will have to cut gas tube shorter in some cases.
Not too happy about way gas block attaches to first segment of outer barrel. One pin and small set screw is all that holds gas block to barrel. Gas block is connector for ALL barrel extension, so if it comes loose, the entire barrel wobbles. Slide fit only. Should be threaded on both ends.