It looks like Atlantic Firearms is selling an adaptor for the B+T weapons that use the MP9 stock.  Has anyone used one yet?  It's a little disconcerting that the BH bolts get tightened directly against the polymer and only engages on the rim of the bolt head.

Yeah I cant believe they wouldnt include some sort of oblong washer to go between the screws and the polymer.

I have wanted to try it also but without any decent sized brace available to aesthetically fit the Tp9 I cant imagine it would be very useful.

Hey folks.  Long time arfcom reader, but never posted before.  Thought I would share on this topic as I just recently got a P26 and APC9 and am using this adapter.  I can say that without a modification the adapter WILL move around unacceptably.  I measured and found that the void in the adapter is approx. 1/4".   I found a piece of steel 1/4" OD tube and drilled to fit over the 10-32 bolt that is used in the adapter and cut a short length.  I used that with a washer I had available (I want to find an appropriate black washer).  With this done the adapter becomes rock solid.  Note that I also found that the bolt opening on the right side is counter sunk for a socket/cap bolt rather than a button head.  I found an appropriate length 10-32 bolt for this side and I think this helps as well.   I'm using a Shockwave Blade until my stamp comes.  

Great info. Thanks for posting this. I have an APC45 and have been considering a P26 but the adapter fragility was holding me back.

It will work, but you unfortunately have to put some effort into making it "right".  The adapter piece itself is fine, but their final execution in terms of what they give you to mount it just blows.

Thanks for the feedback. They need to fix it.

Everything you need to make that adapter work perfect is available at McMaster-Carr for pennies and no modifications of any kind are needed. Bolts, flange sleeve washers, etc.

https://www.mcmaster.com/#