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I'd have to dig out the pics, and don't really want to hijack your thread...but I modified my first one when Nordic Components was still selling their kits (before Ruger released the SR-22), and a Jim King barrel from the US, before the BATF went crazy with the ITAR stuff. Jim King basically takes factory Ruger barrels, and then modifies them to have the M4 contour and utilize a regular A2 front sight block, birdcage FH, and M4 furniture. Spent a bunch of money on it...lol.