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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..

Lower spring load and designed for normal/stock plunger tube. FPS should be around 125-130FPS range. Requires a separate Worker Stefan Adapter to work with.Parts included:- Metal Breech- Metal Barrel- Spring (est 7+KG)- Breech Oring- Full Length Breech (FREE)Choice of front adapter(Sold Separately)-..