These German G3 Collapsible Stocks will work on original HK, JLD PTR91, Century Arms, Federal Arms, or Special Weapons G3 rifles. Some of these may be a tighter fit than others, but all will work well.
Installation is a snap! Simply remove the two stock retaining pins of your current G3 stock, remove the stock, and put this new stock on. You will use your existing stock retaining pins with the new stock.