Compatible cylinders for JG069 SMG-5J?

Really not sure why they're marketing it specifically for any type of MP5 to be honest. Barring a few exceptions most AEG cylinders are the same length (within tolerances). The important bit is where the vent hole is for your length of barrel. A 220mm barrel would be more like a 3/4 hole, that one looks like a 4/5 hole so may be a bit over volume for what you need.

One like this - https://www.ak2m4.co.uk/internal-parts/cylinders/xt-cylinder-anti-heat-3-4

 
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