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Today I got a chance to try swapping the handguards from my t-pro, and my Dad’s older M4. The rear capture ring of the old barrel has a spring, the new one doesn’t, but it does have two springs on the handguard itself. I can’t speak to how it would hold up long term, but it does fit.

thank you, we both looked it up and he trimmed just a little off his spring and everything was normal

It's the size of the shell used, not all shot shells are the same length from different manufacturers; there are a few threads on this subject.

Yes, you could do this. For a SBR or SBS, you could remove it from the SBR or SBS configuration and then just sell the parts. That’s all they are - parts. You wouldn’t want to sell it to them to the same person as that would go to constructive possession. For just about every single SBR or SBS out there, I’d tell you that it would be a waste of time. Having said that, the M4 components are pretty hard to find and you probably could get decent money - at least on the barrel. I think I paid $800 for mine. So… what’s a fair price? While I paid $800 for mine, I’ve seen them sell for stupid money - $1500. I’ve also seen them go for a lot less than $800. Bottom line, there’s a market for your entry barrel. I don’t know what kind of coin you’d get for the receiver - you’d have to find somebody that wants a receiver and all the rest. In fact, now that I think about it, I might be tempted to buy everything *other* than the barrel. Why? Because I took a barrel off an M4 to make my SBS so I got a barrel hanging around. So… considering that I could buy a brand new M4 LE shotgun for about $1800, and the 18.5” barrel is about $650 from Benelli, that works out to be $1150 for everything but the barrel. And, uh, in my case, if I’m buying a used gun, despite how little it was used, my starting point is 60% of what I can find it for elsewhere. So… that’s what, $700 or so for everything but the barrel? And that’s a big if - am I gonna have to spend money to get the tube extension? It wouldn’t take much for me to say, “Meh, maybe I’ll just spend $1800 and get a new one…” Bottom line, you’re gonna have to find the right two people to buy your stuff. Or you could just buy a used 18.5 barrel and put it in Title I configuration and sell the complete gun for $1000-1500 or so. And then sell the short barrel to somebody.