This is a gun stock adapter kit that allows you to adapt any AR15 grip and butt stock to your Benjamin Marauder. In recent years the AR15 industry has exploded and there are seemingly limitless options for stocks and hand grips. This kit is a direct bolt on for any Gen 2 Marauder, and allows you to install any AR15 grip and butt stock. The butt stock adapter also includes our large diameter hammer spring adjuster that allows replacement of the hammer spring by simply removing the stock from the back (no removal of the adapter necessary, so no need to unscrew the breech). With this kit, and our light weight air cylinder installed, this otherwise stock, full size, Marauder tips the scales at a dainty 4.5lbs. Note, the butt stock shown is a very light weight version that we made in house, and will be adding it to the website. The kit only includes the adapters and does not include a butt stock or a hand grip. This kit is fully compatible with our TSS kit if you already own it. If you don't already own the TSS kit, then just add the springs option, and get the full functionality of our TSS kit at the same time.