Right I've just bought an A4 bolt, which it says on the packaging will fit into an LCD, IR3,Speed and A4. Mines an LCD. The bolt fits into the breech ok but when I go to shut it, it won't quite shut fully. When I investigate why it looks like the bolt pin (the thing that stick out of the bolt and links it to the ram) is too long. When I compare it to my stock bolt pin it's about 2->3 mm to long. Do I have to screw or hammer it in a bit more or what. Help Please!