CMMG perfects the drop in AR .22 conversion.

[Jer]

Blackdog/cmmg/cienner style mags are pretty much the defacto mag for .22 AR conversions. That mag will work with all the major conversion bolts, all the major dedicated uppers, the sig 522 and whomever else decides to use them. To use a computer term, they're an open standard. M&P15 mags only work with the that rifle, hence my use of proprietary. I have a dedicated .22 upper, a conversion bolt and plan to get a sig522. Being able to use one mag format is huge for me. But that's me. Most people could probably care less.

We're in agreement though that no matter if you use a conversion or a dedicated 22 rifle you are going to be buying a more rare mag that is proprietary to that rifle as in you can't swap it between your other AR15's which is where the price savings and selection comes from. That's the point I was making. I got a few mags for my M&P15-22 for cheap and that's all I need. They work well and I didn't find myself saying 'Damn I wish Magpul made mags for this' because it wasn't necessary.

M&P15's are slick rifles, nothing wrong with them. I just have different wants.

I can respect that and that's all I was trying to do was open a dialog to find out why some chose what they chose. I wasn't condescending or negative with my post asking why not a dedicated rifle... just curious.