If you own the Rare Arms XR25/110 Shell Ejecting Gas Blowback Rifle and find it hard to acquire more shells for your uses, you might want to build these yourself. Is it possible? According to Schießstand [GHG] Airsoft, you can... "Yes it is - here you can see how it can be done."
The made in Taiwan Rare Arms Shell-Ejecting XR25 Enhanced Carbine GBB-R is now in stock at eHobby Asia. A unique airsoft rifle for now, this is a semi-automatic firing CO2-powered gun with the CO2 bottle stored in the pistol grip. The receiver is metal with a stainless bolt carrier and ambidextrous fire selector. The magazine can take in a max of 15 rounds.