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its a TM so you take out the rear receiver pin and just pull the mechbox right out, then remove the forward pin, slide out the hopup unit, remove the barrel lock, and very CAREFULLY remove the barrel by rotating and gently pulling, if the hopup is on or you pull too hard you'll rip the hopup rubber.
put the hopup rubber on the other barrel and grease the exterior of the hopup sleeve and interior of the hopup chamber, put it in the same way you took it out, gently pushing while rotating, make sure the barrel is aligned (the slot for the hopup is pointing up), then put it all back together
very easy thing to do, and hopup rubbers are only like 5$ lol
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