Quoted:
The mag fits a real AR15. Just tried it before putting it away. More than likely I will never do anything with it. I still need to find out what blanks it uses. The newer model uses 5.56 blanks it seems. This one the blanks are a 1/4 inch shorter.
GVS
Try a real AR mag in the MGC. It should not fit. I have tried several times to insert real AR mags in all four of my MGC M16's and they will not go in. The mag well is just undersized "On Mine". The newer M16A1 variant. That is now produced by Marushin of japan will take real AR15 mags. It is a bitch, because of the four MGC prop guns I have, none came with mags!! The only mag I have seen for sale was over $100 without shipping. I was able to get parts and a mag for the later M16A1, but coming from Japan it was pretty damn expensive. I will measure the mag wells to see what the difference is between real AR's, and the older MGC!!
Side note about the blanks! I am about 97% sure they use the plug fire cap which is inserted in a custom brass .223 shell. Last I seen they were pretty spendy. I will see if I can find a few links...
These guy's know their stuff, and can answer any question...
British Model Gun Forum Link