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Hey guys, I'm trying to kitbash some of the Marx 88mm Flak guns into some 40k artillery. I'm having a problem attaching the nova cannon bits to the barrel. I've seen some examples of these models converted, and they looked amazing. I tried to pm the guys who made them and I have not received any responses. I've tried to attach the nova cannon bit with a piece of plasticard tube and it just fell off. I'm not sure what the best way forward for this would be, or what can be done to make it look awesome. Any help would be greatly appreciated. Thanks in advance.

At first glance, I would say saw the gun's barrel off a little bit, then pin and/or glue it on and then fill and gaps with GS. Then sand GS when dry to give it a seamless finish.

Looking at the barrel on the left I would suggest sawing where you have the grooves near the end.

my two teef
bworm

I would fit a polystyrene rod, polystyrene tube or wooden dowel into the black barrel using very thin polystyrene sheet or paper as a shim to get a tight fit. If you are using paper as your shim, Superglue is best to stick it on plastic, and PVA is best for a wooden dowel.

Cement the rod/shim into the barrel with epoxy resin like Araldite, then fit the other end into the grey barrel the same way.

There will probably be a groove left around the join. That can be concealed with putty or a strip of paper or thin plastic.