These guns are beautifully made. They have been printed in clear resin. Details and surface finish are excellent.
Their manner of packaging made it all but impossible to understand which parts were the barrels. COmpetitors print their barrels as separate parts that must be mnounted. Di Stefan print theirs as part of the gun. The barrel is almost exactly the same length and diameter of the sprues on which the parts are mounted. I damaged a couple of barrels this way but was fortunately able to replace them with brass barrels from my stock.
Their service and trun-around time were first-rate, the best I've experienced in purchasing 3-D printed parts.
I will use them again, and I hope they expand their product line. My only suggestion is to make clearer what s sprue and what is part.