You need the M16 base, ARMS19s has a single lever and is smaller than than 19. You'll have to remove the terrible muzzle brake (not an easy thing to do yourself), if you're lucky the muzzle is threaded, if not the gun shop will have to thread it, all in all, I think you should have bought a preban barrel.
The TA01NSN has the TA51 mount, the TA11 has the ARMS 19S.
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