It's a Browning Mk III made in the mid-90s by the original masters of gas blowback airsoft, Japanese firm JAC.
Firstly, MK Council should enforce the covenant on most houses in MK that prevents vans, etc, being brought home.
Mk 6 and all carriages were declared obsolete in 1913.
Disp A three character code indicating the dispersion used to determine the mk spectral type, or a quality for the spectral type.
This last spitfire was a fully fledged ground attack aircraft that used the short barrelled Hispano Mk 5 guns.