The gun uses a non removable breech plug and is powered by a 45 win mag casing , it can use up too 250 grains of of pryro or t7 pellets or loose your choice. it uses a lothar walther barrel and howa remingtion actions, and stocks from boyds, ans soon i belive a contract with hs percission for some synth versions, after a day of shooting cleanup is easy usually 4-5 patches and your done. call the shop and talk to the guys