Higher spring load, longer barrel, designed for expanded plunger tube. FPS should be around 180FPS range.Parts included:- Metal Breech- Metal Barrel- Spring (28n long spring)- Breech Oring- Full Length Breech (FREE)Choice of front adapter(Sold Separately)- Metal Stefan Kit Front Muzzle Adapter- Plas..
Should fit normal plunger tube too but you need this if you want to use expanded tube or you can shave your current bolt sled to make it fit.Parts included:- Bolt Sled- Bolt Sled Pin..