CA M4

[Jimmer]

All, I have currently a CA M4 and CA m16. Would like to have the M16 barrel on the M4 as it’s newer and has detachable carry handle. Can I just transfer it over? If so, where do I start!!??

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[Colin Allen]

You should be able to as they are both CA.

If you take off the handguards, you should see something that looks like a gearwheel at the rear end; this can be unscrewed, ideally using an armourer's wrench.

If you are going to change the inner barrel as well, you might need to open the gearbox and change the spring to get the power as you want it.