Winchester 1300 mag tube throats: 2 piece vs. one piece questions

[1KPerDay]

So, as usual I've taken way too long and spent way too much money on this project. Long story short I bought a 20 gauge 1200 for my boys, and then bought a 1300 parts kit (both 20 gauge) with everything minus the receiver, now have a used receiver at FFL. I also bought the rare "Defender" style 20 gauge barrel and took a couple of years to find the proper mag tube (until recently they were unobtanium; but are now commonly available for some reason). I guess that wasn't really short. Sue me.

Anyway, I'm having trouble locating the proper mag tube throat for the 20 gauge defender mag tube, which is threaded at the receiver end, requiring a one piece throat. The parts kit and existing 1200 have two piece throats for the 5-shot, non-threaded mag tubes.

So: anyone know if I can get a recent-manufactured 20 gauge one piece throat, even if my receivers are older than that stipulated below?

http://www.midwestgunworks.com/page/mgwi/prod/U1238223

Winchester 1300 Magazine Throat 1 Piece. Fits All Winchester Models 1300 Shotguns Above Serial #L3413900

OR do I have to try to track down a 20-gauge version of this?
http://www.ebay.com/itm/like/171975...azine+Throat&vectorid=229466&tc=US&rmvSB=true

 

[1KPerDay]

anyone?

 

[1KPerDay]

soooooooo..........

 

[1KPerDay]

Still can't find an answer to this... anyone?

 

[entropy]

Buy the MGW part and modify if needed.

 

[1KPerDay]

well I'm going to try this. says it's for 1400-1500 but looking at pics compared with 1200 one piece throats it appears identical. If it doesn't work I guess it doesn't work.

http://www.ebay.com/itm/351770113657