During the 1970 - 1983, Colt manufactured Mk.IV series 70 Government model pistols, which closely resembled original M1911A1s, but with accurized barrel bushings.
The "Accurizor" barrel and bushing was intended to improve the intrinsic accuracy of the Colt Government Model pistols, which were then designated the MK IV/Series 70 to differentiate them from all prior variations of the Government Model. While not as capable of superb accuracy as a true hand-fit barrel and match bushing, the new setup nonetheless allowed the typical mass-produced Colt shoot better than the older military-spec pistols with their loosely fit solid bushings and straight barrels.
In this case, you have the shell ejecting 1911. Each shell loads 1 BB and the magazine itself can have up to 8 shells in its magazine shooting at around 320 fps. It's incredibly realistic and has decent blow back. Marushin usually make quality airsoft guns and they do not disappoint this time around!