Use of a blue gun is a really good idea. There has been a case of someone deforming the frame on an M&P from "over pressing".
There is enough heat (approx. 340 degrees) transferring into the polymer to make it deform and hold shape under pressure....With exercised caution, using an actual gun is fine, but if you don't want to take the risk its worth $30.
As per brand of training gun, the ASP and "blueguns" brand seem to be identical (in the samples I've seen) as far as accuracy. They are afterall
just a mold of an actual firearm.
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