G&P M249 Feed Tray on Classic Army.

[Coski]

Hey all.

Recently bought a G&P M249 feed tray for my classic army, after checking out a few websites that confirmed it would fit.

However, after fitting it today, the tray wont seem to lock in at the at the rear where the tabs are. Its as if somethings obstructing it, but I've looked and can't see anything.

Can anyone confirm to me if the feed tray should fit? Really trying to work this out!