Board Thread:General Nerf discussion/@comment-27035444-20160728160238/@comment-3362895-20160728185522

I can only speak of the ones I use. They were black and printed in China, then brokered by an eBay vendor in Pennsylvania IIRC. This model did not have a front flange like the stock cylinder, and did not come in two pieces with a separate shaft. Caveat: NerfGunAttachments on YouTube discovered that his Hammershot gradually performed more and more poorly after installation of that same model. The problem was mysteriously fixed by removing the air restrictor.

Another thing to watch out for is that often, 3D Nerf hobbyists will often refine their designs over several versions, so a negative review on one product will not necessarily be representative of subsequent releases.