It took a little more work and money than I wanted, but it was fun regardless. Up here in Canada you cannot buy the 8 inch version of the kit, only the 16 inch version is available (though it's sold out). So I bought the 8 in barrel separately. I then found out the hard way that the shorter barrel does not allow the bolt to cycle properly due to lack of pressure from the expanding gases,shorter barrel=less pressure. I ended up having to sand down the end of the bolt that comes into contact with the hammer, as well as polish the trigger group by hand. It works now!