ammo store is a good place to get the parts. barrel, feedway spacer,proper barrel booster.
to be very honest with you I threw all of thies parts away after I had so much trouble with them. I know some guys had good luck but not everyone. it cost me a crap load of bucks in dammage and waisted conversion parts not to mention all the now stagnant ammo I am stuck with.
yes I did work with the experts at 1919-a4 .com and no I did not give up rite away. but eventualy I just had to stop throwing money at this.
I am not the only one that had to give up.
please do not take my words as all gloom and doom just advise to go into it slow and do not expect mericals. I would not buy a huge bulk of ammo till you see it run reliably. that is all good luck! HB