12-07-2006, 03:28 PM
I recently purchased a usr-11, knowing it's upgrade potential and compatibility with the vsr-10. I have spent a few weeks searching online for parts and help and have only come across a specific spring to purchase that increases the fps of my rifle to an fps range of 450-520. When I thought my problems were over, I read soon after that additional upgrades are necessary in order for the rifle to accommodate such a power increase such as a new spring guide and piston. Could anyone send me specific links to specific items needed to make the upgrade I need? It would be greatly appreciated.