Yah its a little goofy looking. It looks OK in my XD-40 Tactical with the magazine well. In my XD-40 Service without the mag-well it does look goofy.
The extension would give you +3 in 40S&W or 357Sig for a total of 15 rounds. It should give you about +6 in 9mm. I don't have a 9mm XD but using my XD-40 magazine body I was able to get 22 9mm rounds in the magazine. With 45 GAP I would expect +2 but did not have any way to test it.
The magazine is just a shade under 140mm in length this makes is legal for shooting USPSA limited division.
This is the first prototype and yet untested. It uses the stock spring and follower. The factory basepad and basepad lock are not used. It seems to cycle snap caps well in my testing no mater how fast I cycle the action. I will be going to the range tomorrow night and put it though its paces.
What do you guys think? I designed it to be functional and sacrificed aesthetics to aid machine-ability on my relative small CNC mill I have access to at work. How important would looks be to you? Any other functional or cosmetic suggestions, fire away.
I have been working on this extended capacity magazine basepad and my version of a magazine well off and on for awhile now. I still have a good bit of re-engineering to working out some of the details on the magazine well but the extended capacity magazine base pad is a much simpler project and with a few more tweaks I could probably make up a small batch of these.
If I get enough interest I believe a friend of mine can help me make these on a much larger CNC he has access to. It took about 2.5 hours to make this one on my small CNC, not quiet cost effect.
Speaking of cost what would you guys pay for this. The only extended capacity basepad available for the XD is the Pearce extension and they go for $10. Fancy CNC milled aluminum extended capacity base pads for race guns like Dawsons precision go in $30+ ranges.
What would you be willing to pay for a CNC machined Delrin basepad?
Any comments, suggestions, or question are more than welcome and desired.
ETA: I was playing with it some more and I was able to get a 16th 40S&W round in the magazine. It was very stiff to insert and would not drop freely when releasing this full of a magazine. It apears the bottom of the magazine tube swells slightly under the pressure. But I was able to get +4.