on the 14.5 with phantoms, does Bushy pin or solder?  thanks

On 14.5" barrels with the Mini-Y comps, they are pinned and welded.

I have the Bushmaster 14.5 with a Phantom that is both pinned and welded over the pin.

I just popped one off last week to put a KX3 Flash Suppressor on.
It was just pinned use these same instructions Remove your MINI-Y Comp brake at the bottom of the page!
I cut on both sides and then I used the chisel to split it completly into two complete halfs, it fell apart and I didnt have to do anything to the pins.
I think they also use locktight which would not let me start the threads with the KX3. I had to wire wheel it clean gently!
Hope this helps.
Dont forget to take to a gunsmith and let him make your new replacment permanent to keep within the laws. Taking it off myself, saved me about I figure 45 bucks.
*Edited for slightly improved engrish!

when you guys got those barrels how did you change the front sight and what did you end up using????? I'm in CT and like these bbl's, but want to have options open for diff sights!