Sometimes my Marui Detonics after firing and with bb's in the mag , locks the slide not just the end but seems that the slide was locked by the hammer, stuck under the bb unit
the first symptoms of this issue appeared arming the gun; the slide come back smoothly but when it is time to return in position the hammer prevents the slide to come back unless the slide spring is quickly released.
Cycling manually the Detonics without mag I have the same issue: the hammer locks the slide
I think may be something slack or weared so I upgraded to PDI Oval Hammer and Sear.
The situation is better only with the new hammer and the old sear.
I post a link of a video where the issue is well visible
http://www.youtube.com/user/rickyvam.../0/W6j1gNuaT_g
Marui Detonics is very like alla the Marui 1911 series so I think many users may have encountered this issue.
ps my Detonics has already fired 5000bb's