Quick M1 carbine type question. Finally got a "machine gun" (Norrell disconnector lever and all the "parts") which can be installed into any USGI M1 carbine. Not being much of a history buff, I really want to chop the barrel, which I believe I can freely do since, once installed, the trigger housing parts magically tranform said carbine into something more dreadful than a "rifle", i.e. it is not subject to any restriction on barrel length at all. No Form 1, no $200 check, no stamp, nadda. But, say, after a few hours at 750 rounds per minute, I really really need to replace my shortened barrel. Ordinarily easy enough on ye olde carbine, BUT, if I remove the trigger housing while unscrewing the barrel from that "rifle" to install a new barrel, have I "inadvertently" created an unregistered SBR (I have many other "M1" carbines)? I know that only the ATF can tell me the answer (can they?), but just seeking opinions here. Perhaps this issue has arisen before and my google foo is temporarily farked and I just overlook something obvious. Been known to happen, even here, but I did search
TIA
TIA