LMT CQB SBR questions

[Collector0311]

Just bought a 14.5" LMT CQB and had it pinned with a hider out to 16.25". Here's the question.I'm waiting for SBR stamp to clear, when it does, would I be better served to get my existing barrel cut down, threaded, and crowned? Or would it be cheaper and less hassle to buy a new barrel/upper?
End game: 10.5" SBR
Thoughts?

 

[CoRoMo]

I might just be overly cautious, maybe to a fault, but I wouldn't want to cut the barrel of a gas operated gun. I don't know enough about dwell time and such to be confident that I wouldn't screw up its operability. I think there is less hassle in buying something that was built to run the way it was built as opposed to make something run in a way that it wasn't originally constructed.

 

[MrCleanOK]

You'll be better off with a new barrel (or upper receiver assembly, if you want to go that route). Given the same gas port location, barrels of different lengths will need different gas port sizes. The shorties can be finicky, which is why you will often see people getting to SBR status by building their rifle as a pistol first (with the desired short barrel, and no buttstock), working the kinks out, then applying for the tax stamp to SBR it.

 

[JustinJ]

Definitely a new barrel. Especially with the LMT quick change barrel system.

 

[Charger442]

its all just a money game, really. i am going to assume that you are not the one who is going to do the gunsmith machine work of cutting, crowning,(re-profiling and drilling a new gas port depending on where it is now) and re-threading the barrel.... so unless you know someone who can do it for cheap or for free, you should buy another upper and sell the one you have.

or keep the one you have too. again, it all comes down to how much money you want to spend.